North America, Regions and Economy

Explore North America from the Arctic to the tropics. Learn how its mountains, plains, rivers and climates formed, why it faces earthquakes, hurricanes, tornadoes, droughts and wildfires, and how people prepare for them. Then follow its people, cities, farms, resources, industries and trade to see how Canada, the United States, Mexico and their neighbors are linked to each other and to the rest of the world.

Grade 6, Grade 9, Grade 5, Grade 3Lesson 1 of 1 in World Regions for Ages 12 to 16 Course

What you will learn

  1. Define the region, find its countries, and describe the landforms and water systems that shape where people live and work.
    • Define North America and find its countries
      Say what counts as North America, locate its countries and subregions, and explain why one place can belong to different regions.
    • Describe the landform regions from west to east
      Identify the great landform regions, explain how their age and rock make them different, and link them to human use.
    • Trace the rivers, lakes and seas that connect the region
      Follow the main water systems, explain how they serve people, and show why shared water needs shared rules.
  2. Use latitude, oceans, height and mountains to explain why climates differ, and link each climate zone to its vegetation and land use.
    • Explain what controls climate
      Use climate factors to explain differences between places, including with real temperature and rainfall figures.
    • Match climate zones with vegetation and land use
      Locate the main climate zones, describe their natural vegetation, and explain how climate shapes what people do with the land.
  3. Explain why earthquakes, volcanoes, storms, droughts and fires strike where they do, how climate change affects them, and how places prepare for and recover from them.
    • Explain earthquakes and volcanoes along plate boundaries
      Use plate movements to explain where earthquakes, volcanoes and tsunamis happen, and how local ground conditions change the damage.
    • Explain storms using air masses and weather maps
      Use air masses, fronts and warm seas to explain blizzards, tornadoes and hurricanes, and read a simple weather map.
    • Explain drought, heat, wildfire and climate change
      Explain how dry and hot conditions build into hazards, and how climate change is altering the risks across the region.
    • Compare how places prepare for and respond to hazards
      Use the stages of hazard management to judge responses, and explain why the same hazard harms some places and people more than others.
  4. Describe how the population is spread, who its peoples are, and how migration has shaped and keeps reshaping the region.
    • Explain where people live
      Calculate and compare population density, describe the pattern of settlement, and explain it with physical and human factors.
    • Describe the peoples and cultures of the region
      Identify Indigenous, European, African, Asian and other roots, describe languages and federal states, and read cultural clues in the landscape.
    • Explain migration into and across the region
      Use push and pull factors to explain past and present migration, and describe its effects on sending and receiving places.
  5. Describe the urban pattern of the region, the power of its world cities, and how land use, transport and inequality shape life inside a city.
    • Explain urban growth and big urban regions
      Describe how the region became mostly urban, tell a city from its metro area, and explain how cities grow, join up and sometimes shrink.
    • Describe the power of North America’s world cities
      Explain what makes a world city, compare the roles of New York, Washington, Los Angeles and others, and show how networks link them.
    • Read the structure of a city and explain its inequality
      Describe the parts of a North American city, explain sprawl and edge cities, and explain how segregation and polarization divide people.
  6. Link farming, resources, industry and services to their locations, then trace the trade, money and people that tie the region together and to the wider world.
    • Explain the region’s farming regions
      Connect climate, soil, water and markets to farming patterns, and weigh the benefits and costs of commercial agriculture.
    • Explain how resources and energy shape regions
      Locate key resources, explain how they create jobs and trade, and weigh the costs of extracting them.
    • Explain changing regions of industry and services
      Use location factors to explain the rise, decline and shift of industry, from the Rust Belt to the Sun Belt, Silicon Valley and northern Mexico.
    • Trace trade inside North America
      Explain the region’s free trade agreement, follow goods across borders, and judge who gains and loses.
    • Trace North America’s links with the rest of the world
      Follow goods, money and people beyond the region, and compare how development differs across it.

North America Regions study guide

6 chapters

1

Map North America’s lands and waters

North America’s physical setting helps explain its settlement and economy. Its wide latitude range spans Arctic ice and tropical lowlands, while mountains, plains, and old rock create different opportunities. Political maps group land by governments; physical maps reveal landscapes and water systems. Reading both helps you follow how rivers, canals, borders, and coastlines connect places across the continent.

1.1 A continent with several kinds of regions

North America reaches from the Arctic to the tropics. It is the third-largest continent, after Asia and Africa, and covers about 9.4 million square miles (24 million km²). Its southern land boundary lies between Panama and Colombia.

Find the countries and waters

Canada, the United States, and Mexico occupy most of the continent. Their capitals are Ottawa, Washington, DC, and Mexico City. North America also includes the seven countries of Central America, the Caribbean, and Greenland. In total, it contains 23 independent countries, as well as territories. Greenland is a self-governing part of the Kingdom of Denmark; Puerto Rico is a US territory.

The Arctic Ocean lies to the north, the Atlantic to the east, and the Pacific to the west. Find Hudson Bay inside northeastern Canada, the Gulf of Mexico south of the United States, and the Caribbean Sea east of Central America. Alaska faces Russia across the narrow Bering Strait. These waters help explain routes to Europe and Asia.

Choose a region for a purpose

A region groups places by shared features. A continent is a physical grouping; a cultural region may follow language and history. Mexico belongs to North America geographically and Latin America culturally. The United Nations places Mexico in Central America for statistical reporting. Some courses use Mesoamerica for Mexico and Central America. Identify the purpose before deciding what a regional name includes.

Political and physical groupings can also differ. Hawaii belongs politically to the United States, but its islands lie far out in the Pacific. Greenland belongs to a kingdom centered in Europe, but is geographically North American. In everyday English, “America” often means the United States. “The Americas” means North and South America together.

Use latitude to see the scale

The Arctic Circle crosses Alaska and northern Canada near 66.5°N. The Tropic of Cancer crosses Mexico near 23.5°N. Most of the continent stretches between about 83°N and 7°N. The difference is 76 degrees. At about 69 miles per degree of latitude, that is roughly 5,240 miles (8,440 km). Such a large north-south span allows both polar ice and tropical forest.

Ottawa lies near 45°N and Mexico City near 19°N. Their roughly 26-degree latitude gap helps place them within the continent’s temperate and tropical parts. Alaska’s narrow Bering Strait crossing lies less than 60 miles (about 90 km) from Russia, much closer than its position on a world map may first suggest.

Read borders carefully

Canada is the world's second-largest country by total area, at about 3.86 million square miles (9.98 million km²). The United States has about 3.8 million square miles (9.83 million km²), and Mexico about 758,000 square miles (1.96 million km²).

The Canada-US border is 5,525 miles (8,891 km) long, including Alaska. Much of its western section follows the 49th parallel. The US-Mexico border stretches 1,954 miles (3,145 km); the Rio Grande forms much of its eastern section. A river border follows a natural feature. A straight border along latitude follows an agreed line on a map.

Key Takeaways

  • North America includes Mexico, Central America, the Caribbean, and Greenland.
  • A region’s boundaries depend on the purpose of the grouping.
  • Political membership and physical location can differ.
  • Latitude helps explain the continent’s wide climate range.

1.2 Mountains, plains, shields, and plateaus

A physical map shows broad regions with different heights, shapes, and rocks. These landform regions help explain where people farm, mine, build roads, and settle. Travel from west to east to keep their positions clear.

Cross the western mountains

The Western Cordillera is a wide belt of mountain ranges, plateaus, and basins extending from Alaska to Mexico. The Rockies lie inland. The Coast Ranges, Cascades, and Sierra Nevada stand nearer the Pacific. Between the ranges lie dry basins and high plateaus; the Colorado River carved the Grand Canyon into the Colorado Plateau.

The continent's highest peak stands in Alaska at 20,310 feet (6,190 m). It is widely known as Denali; US federal agencies restored the name Mount McKinley in 2025. Badwater Basin in Death Valley lies 282 feet (86 m) below sea level. To find the height difference, add the distance above sea level to the distance below: 20,592 feet, or about 6,280 m.

Cross the center and east

The Interior Plains stretch through the continent's center. Layers of sediment form gently rolling land with deep soils. The western section is the Great Plains, including the Canadian Prairies. The plains rise toward the Rockies: Denver is about 5,280 feet (1,610 m) above sea level. Flat-looking land can still be high.

Around Hudson Bay lies the Canadian Shield, a huge area of ancient rock. Ice sheets scraped away much of its soil and left many lakes. Thin soil limits farming, while metal ores, forests, and flowing water support mining, forestry, and hydroelectric power.

Farther east, the Appalachians extend from Newfoundland to Alabama. They are older and more worn down than the Rockies. The Appalachians formed more than 250 million years ago; the main uplift of the Rockies came much later, roughly 80 to 55 million years ago. Erosion has had longer to wear the eastern mountains down. Height also depends on uplift and rock strength, so it is a clue to history, not a clock.

RegionPhysical featuresHuman use
Interior PlainsBroad, gently rolling land and deep soilsLarge farms and transport routes
Canadian ShieldOld rock, thin soils, many lakesMetals, timber, and water power
Coastal PlainLow land, marshes, deltas, and beachesPorts and tourism, with coastal flood risk

The Shield covers about half of Canada, with much rock more than 2.5 billion years old. Its age differs from the much younger western uplift. Mount Elbert in the Rockies reaches 14,440 feet (4,401 m), compared with 6,684 feet (2,037 m) for Mount Mitchell in the Appalachians: a gap of 7,756 feet. These peaks illustrate the broad contrast in mountain height.

Add Mexico and the ice-age landscape

Mexico's central plateau lies between the Sierra Madre Occidental in the west and Sierra Madre Oriental in the east. Volcanoes cross its southern edge, including Pico de Orizaba, about 18,500 feet (5,600 m) high. Mexico City stands at about 7,350 feet (2,240 m), giving it a milder climate than nearby tropical lowlands. The Yucatán is a low limestone peninsula with few surface rivers.

Past ice sheets covered nearly all of Canada and part of the northern United States. Moving ice deepened lake basins, carved coastal fjords, and left ridges of sediment. Most of that ice disappeared thousands of years ago. A large ice sheet still covers most of Greenland.

Key Takeaways

  • The Rockies lie inland within the wider Western Cordillera.
  • The Great Plains rise toward the west.
  • Thin Shield soils limit farming, while rock and water support other industries.
  • The Appalachians have experienced much longer erosion than the Rockies.
  • Mexico combines a high central plateau with low coastal regions.
  • Ice sheets shaped many northern lakes and valleys.

1.3 Water routes and shared water

Water connects regions that may look separate on a political map. A river can carry grain, generate electricity, supply farms, and cross an international border. Each use changes the choices available downstream.

Follow drainage, not the bottom of the map

A drainage basin is all the land draining into one river system. A tributary joins a larger river, while a divide separates basins. The Continental Divide follows high ground through the Rockies. On its western side, rivers drain toward the Pacific. On its eastern side, water can reach the Atlantic, the Gulf of Mexico, or the Arctic.

Rivers flow downhill in any compass direction. The Mackenzie flows north to the Arctic; the St. Lawrence flows northeast. South is the bottom of a standard map, not necessarily lower ground.

The Mississippi flows about 2,300 miles (3,700 km) from Minnesota to the Gulf of Mexico. The Missouri and Ohio are major tributaries. Together, the basin drains parts of 31 US states and two Canadian provinces. Barges move grain, coal, and fuel, while New Orleans serves traffic near the river's mouth.

Trace a Great Lakes journey

The five Great Lakes are Superior, Michigan, Huron, Erie, and Ontario. Only Michigan lies wholly in the United States. Together the lakes hold about 21 percent of the world's surface fresh water. This figure refers to water in lakes and rivers, not all fresh water stored in ice and underground.

Follow a grain ship from Duluth:

  1. It leaves Lake Superior through the Soo Locks and reaches Lake Huron.
  2. It travels through the St. Clair River, Lake St. Clair, and Detroit River to Lake Erie.
  3. It takes the Welland Canal around Niagara Falls to Lake Ontario.
  4. It follows the St. Lawrence system to the Atlantic.

Locks raise or lower ships between water levels. The St. Lawrence Seaway opened in 1959, allowing suitable ocean ships to reach deep into the continent. Chicago, Detroit, Toronto, Montreal, and Quebec City gained links between inland markets and overseas buyers.

Lake Superior alone covers about 31,700 square miles (82,100 km²). The five lakes hold about 84 percent of North America’s surface fresh water. Their large storage and international shores make water quality a regional concern, not just a problem for the nearest city.

Compare water uses

The Colorado supplies farms and cities in the dry Southwest and northwest Mexico. Heavy withdrawals mean it seldom reaches the Gulf of California. Drought and demand have lowered reservoirs such as Lake Mead. The Columbia produces hydroelectricity. The Rio Grande, or Río Bravo, forms part of the US-Mexico border, while the Yukon drains parts of Canada and Alaska.

Shared water requires cooperation. The 1909 Boundary Waters Treaty and 1972 Great Lakes Water Quality Agreement guide Canada-US cooperation. A 1991 air agreement addressed pollution including acid rain, which damages lakes and forests. The United States and Mexico share the Colorado and Rio Grande under a 1944 treaty.

Hudson Bay freezes for much of the year. The Gulf of Mexico supports ports, fishing, and oil production; US federal agencies use the name Gulf of America following the 2025 change. Shrinking Arctic sea ice extends seasonal access through the Northwest Passage, though ice and remoteness still make travel difficult.

Key Takeaways

  • A drainage basin gathers water into a river system.
  • Rivers follow downhill slopes in any compass direction.
  • Locks and canals connect Great Lakes ports to the Atlantic.
  • Upstream water use changes downstream supplies.
  • Shared rivers, lakes, and pollution require cooperation.
2

Explain the region’s climates and vegetation

Places at the same latitude can have very different winters and rainfall. Oceans store heat, mountains lift moist air, and elevation cools the landscape. These factors create climate zones that shape forests, grasslands, and farms. Climate graphs let you compare seasonal temperature and precipitation, while maps help explain why a zone follows a broad belt in one place and a narrow mountain strip in another.

2.1 Why climates differ

Vancouver and Winnipeg stand at nearly the same latitude, yet their winters differ greatly. Latitude sets a broad pattern, but oceans, winds, elevation, and mountains reshape it. An explanation of climate needs these factors working together.

Separate weather from climate

Weather describes conditions at a particular time and place. Climate describes a long-term pattern, usually measured over 30 years. “It snowed yesterday” describes weather. “Winters are usually cold and snowy” describes climate.

At low latitudes, sunlight strikes more directly and concentrates energy on a smaller area. Farther north, the same energy spreads over more ground. Earth's tilt causes seasons: the Northern Hemisphere receives longer days and more direct sunlight in June, and shorter days in December. Seasons do not result from the continent moving closer to the Sun.

Compare coast and interior

Water warms and cools slowly. It moderates nearby land, giving many coasts a maritime climate with a smaller seasonal temperature range. Inland locations often have a continental climate with a larger range.

The annual temperature range is the warmest monthly mean minus the coldest. For the 1991–2020 averages:

CityColdest monthly meanWarmest monthly meanAnnual range
Vancouver3.9°C18.2°C14.3°C
Winnipeg−16.3°C19.5°C35.8°C

For Winnipeg, subtracting a negative gives 19.5−(−16.3)=35.8. The cities' similar latitudes cannot explain this large contrast. Vancouver receives the Pacific's moderating influence; Winnipeg lies far inland.

Westerly winds carry Pacific air onto the west coast. The cold California Current cools the coast farther south, while the Labrador Current chills northeastern shores. The Gulf Stream carries heat along the southeast and toward Europe. Much of the East Coast still receives winter air from the continent, so a warm current does not give the whole coast mild winters.

Climb a mountain and cross it

Temperature usually falls with height, by about 6.5°C per 1,000 m, or 3.6°F per 1,000 feet. Pikes Peak stands 8,835 feet above Denver. Multiplying 8.835 by 3.6 gives about 32°F of cooling. With 80°F in Denver, this simple estimate gives about 48°F at the summit.

Mountains also change precipitation. Moist air rises on the windward side, expands, cools, and releases rain or snow. After crossing the crest, the air sinks, warms, and becomes drier. The leeward side lies in a rain shadow. Seattle receives about 39.3 inches yearly, compared with about 8.0 inches at Yakima east of the Cascades: almost five times as much.

The main mountain belts run north-south. The open central plains allow cold Arctic air to move south and warm Gulf air north. Their meetings produce rapid weather changes. In the Southwest, sinking air near the subtropics and mountain barriers combine to create dry climates. A northern coastal city can therefore have milder winters than a city farther south but deep inland.

Key Takeaways

  • Climate is a long-term pattern; weather is a short-term condition.
  • Latitude and Earth’s tilt shape sunlight and seasons.
  • Oceans usually reduce the seasonal temperature range.
  • Elevation lowers temperature, while mountain barriers redistribute precipitation.
  • North-south mountain belts leave the center open to contrasting air masses.

2.2 Climate zones, plants, and land use

Climate affects which plants can grow and how people use the land. A biome is a broad area with similar plants and animals. Climate zones and biomes often match, but farming, cities, and irrigation can change the natural vegetation.

Travel from the Arctic southward

Arctic tundra has a warmest monthly mean below 50°F (10°C). Mosses, lichens, and low shrubs grow where summers are too short and cold for trees. Much Arctic tundra has permafrost: ground at or below freezing for at least two years. Its surface layer can thaw in summer. Hunting, fishing, mining, tourism, transport, and public services support northern communities; crop farming is very limited.

Farther south, a subarctic climate supports the boreal forest, or taiga. Spruce, fir, pine, and birch stretch across Canada and interior Alaska. Long winters and short summers favor forestry and mining over most crops.

The humid continental zone includes Toronto, Chicago, and Winnipeg. Warm summers, cold winters, and precipitation through the year support forests, grasslands, corn, soybeans, and dairy farming. In the humid subtropical Southeast, hot summers and mild winters favor pine and mixed forests, cotton, rice, peanuts, and poultry.

Compare the western zones

Mountains break western climates into narrow strips. The marine west coast around Vancouver and Seattle has mild, wet winters and cool summers. Large conifers grow in temperate rainforests. Coastal California's Mediterranean climate has dry summers and mild, wet winters. Tough shrubs called chaparral survive the summer dryness; irrigated farms grow fruit and nuts.

ZoneMain moisture patternVegetation and use
SteppeLimited precipitationShort grass, wheat, cattle ranching
DesertVery little precipitationSparse shrubs and cacti; irrigated crops
TropicalWarm throughout the year, often a wet seasonForest, fruit, sugarcane, tourism

A desert is defined by dryness, not heat. Some Arctic lands are polar deserts. Steppe lands receive more moisture than deserts but too little for most trees.

Notice height within the tropics

Southern Florida, lowland southern Mexico, Central America, and the Caribbean have tropical climates. The wettest areas support rainforest. Highland Mexico is cooler because of elevation. Traditional height zones include tierra caliente below about 3,000 feet, tierra templada up to about 6,000 feet, and tierra fría above that. Bananas favor the warm lowlands, coffee milder slopes, and corn and wheat cooler highlands.

City examples help place the zones: Yellowknife and Fairbanks have subarctic climates; Atlanta and Houston have humid subtropical climates. The wettest tropical areas, including parts of Chiapas, support rainforest. Tropical farming includes coffee, sugarcane, and fruit, while beaches support tourism. Natural vegetation and present land use can differ greatly after clearing and cultivation.

Read a climate graph

Read both the temperature line and precipitation bars. A graph with about 58°F in January, 74°F in July, and rain mainly from November to April shows a Mediterranean pattern. The key clue is the dry summer with a wet winter. A mild winter monthly mean does not rule out frost on individual nights. Climate boundaries on maps are simplified: real landscapes change gradually and are also shaped by soil and human choices.

Key Takeaways

  • Cold limits trees and farming in the tundra.
  • Boreal forests stretch across subarctic Canada and Alaska.
  • Western mountains break climate zones into narrow strips.
  • Mediterranean climates have dry summers and wet winters.
  • Deserts are defined by low precipitation.
  • Elevation creates cooler climates within tropical latitudes.
  • Read seasonal rainfall as well as temperatures on a climate graph.
3

Explain natural hazards and how people reduce the risk

Natural events become serious risks when they meet exposed and vulnerable communities. Plate movement explains much of the western earthquake and volcanic activity; moving air and ocean heat feed major storms. Drought, heat, fire, and a warming climate add other pressures. Following the cause of each hazard helps you compare warning systems, building rules, land-use choices, and support for people who need help.

3.1 Moving plates and earthquake damage

Earth's outer shell is divided into moving plates. Their edges explain much of North America's earthquake and volcanic activity. The consequences depend on both the event and the communities in its path.

Compare two kinds of boundary

At a transform boundary, plates slide past each other. Along California's San Andreas Fault, the Pacific Plate moves relative to the North American Plate. Locked rocks store strain until they slip suddenly, causing an earthquake. Sideways motion here does not cause California to drop into the ocean, and this boundary does not create a line of volcanoes.

At a subduction zone, one plate sinks beneath another. Examples occur off Alaska, the Pacific Northwest, and southern Mexico. The Juan de Fuca Plate sinks beneath North America at Cascadia; the Cocos Plate sinks beneath southern Mexico. These boundaries can produce very large earthquakes, volcanic activity, and tsunamis. Mount St. Helens and Popocatépetl belong to this wider active western belt, part of the Pacific Ring of Fire.

BoundaryMain movementMain hazards
TransformPlates slide sidewaysEarthquake shaking
SubductionOne plate sinks below anotherEarthquakes, volcanoes, and possible tsunamis

A tsunami is a series of waves caused by sudden displacement of water, often when the sea floor moves. In the 1964 Alaska earthquake, the tsunami killed more people than the shaking and reached distant shores, including California.

The San Andreas Fault extends about 800 miles (1,300 km). The 1906 San Francisco earthquake killed about 3,000 people, showing the destructive potential of transform motion. Mount St. Helens erupted in 1980, killing 57 people. Its volcanic hazard belongs to a different plate setting from the San Andreas.

Read magnitude carefully

Magnitude describes an earthquake's size and relates to energy released. An increase of one whole magnitude releases about 32 times as much energy. It is not a simple scale where an earthquake of magnitude 8 releases twice the energy of magnitude 4.

The 1964 Alaska earthquake had magnitude 9.2; the 1985 Mexico earthquake had magnitude 8.0. The 1.2-step gap corresponds to roughly 64 times the energy. This comparison describes energy release, not the number of deaths or the damage bill.

Explain damage on the ground

In 1985, strong shaking reached Mexico City from an earthquake off the Pacific coast. Soft sediments of an old lake bed amplified the shaking. Some mid-rise buildings were badly affected, while structures on firmer ground performed better. Distance from the source alone could not explain the damage.

A hazard is an event that could cause harm. A disaster causes serious harm to a community. Strong shaking in a sparsely populated place may cause little damage, while weaker shaking under vulnerable buildings can be disastrous. Large earthquakes can also occur within plates, as at New Madrid in 1811–1812.

People cannot predict an earthquake's exact time. Building standards, drills, and stronger infrastructure reduce harm. Early-warning systems such as ShakeAlert and Mexico's alerts detect an earthquake after it begins and may send an alert before stronger waves arrive. Their seconds of warning are different from predicting the earthquake in advance.

Key Takeaways

  • Transform boundaries create earthquakes through sideways movement.
  • Subduction can produce earthquakes, volcanoes, and tsunamis.
  • One magnitude step means about 32 times the energy.
  • Ground conditions and building quality help explain damage.
  • Early warning detects an earthquake already underway.

3.2 Air masses, fronts, and storms

North America's open center allows very different air masses to meet. An air mass is a large body of air with similar temperature and moisture. Arctic air is cold and dry, Gulf air warm and moist, and Pacific air generally milder and moist.

Read a weather map

A front marks the boundary between air masses. A blue line with triangles marks a cold front; a red line with half-circles marks a warm front. The symbols point toward the direction of movement. An “L” shows low pressure, often with rising air, clouds, and precipitation. An “H” shows high pressure, usually with sinking air and clearer skies.

If a cold front crosses Kansas eastward, clouds and storms may form along it. Colder, drier air follows, often with a wind shift toward the northwest. The map helps you explain a sequence of changes instead of treating each weather observation separately.

Arctic air can push far south as a cold wave. The February 2021 Texas freeze disrupted power and homes that were poorly prepared for extreme cold. A blizzard combines strong wind with very low visibility in blowing or falling snow. The National Weather Service threshold includes winds of at least 35 mph and visibility below a quarter mile for at least three hours.

Cold air crossing a warmer Great Lake gains heat and moisture. It then drops lake-effect snow on the downwind shore. Westerly winds help explain heavy snow near Buffalo, east of Lake Erie.

Separate tornadoes from hurricanes
FeatureTornadoHurricane
OriginPowerful thunderstormWarm tropical ocean
ScaleNarrow rotating columnStorm hundreds of miles wide
Typical durationMinutesDays
RatingEnhanced Fujita, from damageSaffir-Simpson, from sustained wind

A tornado reaches from a storm cloud to the ground. Warm, moist Gulf air meeting cooler, drier air can help create severe thunderstorms, making central and southern North America especially exposed. The United States averages about 1,200 tornadoes a year. EF0–EF5 ratings use damage to estimate winds; EF5 corresponds to estimated winds above 200 mph.

A hurricane has sustained winds of at least 74 mph (119 km/h). Warm ocean water, around 80°F (26.5°C) or warmer, supplies heat and moisture. The storm weakens as it loses this supply over land or cold water. The Atlantic season runs from June 1 through November 30; eastern Pacific hurricanes also threaten Mexico.

A hurricane can also produce tornadoes after reaching land. The storm types differ in scale and origin, but their hazards can overlap. Tornadoes also occur outside the central US core, including the Canadian Prairies and southern Ontario.

Judge more than the wind

The Saffir-Simpson scale runs from Category 1 to 5. Category 5 begins at 157 mph (252 km/h), but the scale leaves out rain and storm surge, the rise of seawater pushed ashore. Harvey's extreme rainfall flooded southeast Texas in 2017. Katrina's surge and failed flood defenses flooded much of New Orleans in 2005. Otis rapidly reached Category 5 before striking Acapulco in 2023, leaving little warning time. Beyond damaged buildings, storms interrupt transport, electricity, jobs, and tourism.

Katrina flooded about 80 percent of New Orleans after breaches in more than 50 levee and flood-wall locations; the revised death count is 1,392. Harvey dropped more than 60 inches (about 1,500 mm) in part of southeast Texas. Otis strengthened from a tropical storm to Category 5 in about a day, with reported losses of 12–16 billion US dollars. The cases distinguish flood-defense failure, extreme rainfall, and very short warning time.

Key Takeaways

  • Fronts mark boundaries between contrasting air masses.
  • A cold front can bring storms followed by colder, drier weather.
  • Lake-effect snow falls downwind of a warmer lake.
  • Tornado and hurricane ratings measure different things.
  • Hurricane wind category leaves out rainfall and storm surge.
  • Storm effects continue through disrupted transport, services, and jobs.

3.3 Drought, heat, fire, and a warming climate

Drought, heat, and wildfire can reinforce one another. Their effects also depend on farming, water demand, and where people build. Climate change alters the conditions in which these hazards develop.

Follow a drought into a disaster

A drought is a long period with much less precipitation than normal for a place. It lowers rivers and reservoirs, harms crops, and dries vegetation. A dry month in a normally wet region can matter more than the same rainfall in a desert.

During the 1930s Dust Bowl, drought struck land where farmers had plowed up much of the natural grass. Bare soil dried out, and strong winds carried it away in dust storms. Families lost crops and income; many moved west to California. Drought began the crisis, but land use increased the damage.

Heat waves bring unusually high temperatures for a place. In June 2021, trapped hot air over western North America helped Lytton, British Columbia, reach 49.6°C (121.3°F). A wildfire devastated the community the next day. Extreme heat increases water demand and can strain power supplies as people try to cool buildings.

Explain how fire spreads

The fire triangle has three parts: fuel, oxygen, and heat. Vegetation provides fuel, and lightning or human activity can provide ignition. Hot, dry weather removes moisture from plants; wind can spread flames and burning material quickly. Fires can also burn in cool weather when fuel is dry enough.

Fire is a natural part of many ecosystems. Danger to people increases when homes spread into wild vegetation. Canada's exceptional 2023 fire season burned more than 15 million hectares and sent smoke across borders, including to New York. Wind-driven fires in the Los Angeles area in January 2025 destroyed thousands of buildings. Smoke carries health risks well beyond the burned area.

The Los Angeles fires destroyed more than 16,000 buildings. Loss of homes near wild vegetation shows how exposure can turn a fast-moving fire into a major urban disaster, while distant Canadian smoke shows a different route by which fire harms people.

Connect hazards to climate change

Burning coal, oil, and gas adds carbon dioxide to the atmosphere. This strengthens the greenhouse effect by trapping more heat. The ozone hole is a different problem; it does not explain this warming.

Canada has warmed about twice as fast as the global average, and northern Canada about three times as fast. Thawing permafrost damages buildings and roads. Less reliable sea ice changes Inuit travel and hunting, while exposed Arctic coasts face more erosion.

Warming can dry fuels and increase heat stress. Warmer air can also hold more water vapor, allowing heavier rain when conditions produce a storm. Warmer oceans can strengthen hurricanes, and rising sea level adds to coastal flood risk. A particular event still depends on weather, land use, and other factors; climate change shifts the chances and severity of some events.

Distinguish two kinds of response

Mitigation limits climate change by cutting emissions, as with wind power or public transit. Adaptation reduces harm from its effects, as with cooler buildings or raised streets. A wind farm may bring cleaner electricity and income while requiring land and new transmission lines. A raised street reduces local flood exposure but costs money and needs drainage planning.

Key Takeaways

  • Drought is measured against a place’s normal precipitation.
  • Land use made the Dust Bowl worse.
  • Fire needs fuel, oxygen, and heat; dry weather and wind aid its spread.
  • Greenhouse gases drive warming, separate from ozone depletion.
  • Warming changes hazard conditions and damages frozen-ground landscapes.
  • Mitigation cuts emissions; adaptation reduces harm.

3.4 Reducing risk before and after a disaster

Two places can face similar natural events and suffer very different losses. Risk depends on the hazard, the people and property exposed, and their vulnerability. Vulnerability is how easily people are harmed and how well they can recover.

Explain unequal losses

Weak housing, illness, poverty, and limited transport can increase vulnerability. A coastal city may have strong buildings but also large numbers of people and expensive property in exposed locations. Wealth helps provide protection, yet severe losses can still occur.

The 1989 Loma Prieta earthquake in California had magnitude 6.9 and killed 63 people. Haiti's 2010 magnitude 7.0 earthquake killed well over 100,000. Similar magnitudes did not produce similar disasters. Building quality, the earthquake's position near Haiti's capital, emergency services, and resources for recovery all mattered.

Follow the management cycle
StagePurposeExample
MitigationReduce potential harm before the eventStronger buildings or flood defenses
PreparationMake plans and practice themDrills, evacuation routes, stocked shelters
ResponseHelp during and immediately after the eventRescue and emergency medical care
RecoveryRestore homes, work, and servicesRebuilding housing and repairing roads

Recovery can improve the next round of protection. Rebuilding a damaged school to stronger standards reduces future vulnerability. Repairing it exactly as before may leave the same weaknesses.

Match warnings with practical help

The National Weather Service and National Hurricane Center track dangerous weather. A watch means conditions are favorable or the hazard is possible: get ready. A warning means danger is happening or expected: take the recommended action. During a tornado warning, shelter in a basement or small interior room on the lowest floor, away from windows.

A message alone does not ensure that everyone can act. During Katrina, some residents lacked a car or a safe destination. Evacuation plans need transport, accessible shelters, and help for people with health needs. Calling every person who stays “careless” ignores these barriers.

Risk perception is different from measured risk. Someone may underestimate a flood after many quiet years, while another household understands the danger but cannot afford to move. Jobs, family ties, housing costs, and the ability to evacuate can explain similar decisions for very different reasons.

Compare protection choices

After the deadly 1900 hurricane, Galveston built a seawall and raised land behind it. Such defenses reduce exposure to some waves and surges. They are costly, can narrow beaches, and may encourage building in places that still carry risk.

Planning can keep new housing away from low flood zones. Stronger building rules reduce vulnerability; buying repeatedly flooded homes can lower exposure. These choices may conflict with jobs, property prices, and family ties. Risk perception, or how dangerous people believe a place to be, also shapes decisions.

Hazards cross borders. Canadian wildfire smoke traveled into the United States, while firefighters from several countries helped in Canada in 2023. Shared forecasts, crews, and water planning can improve response when one country needs more help than it can supply alone.

Key Takeaways

  • Risk combines hazard, exposure, and vulnerability.
  • Similar magnitudes can produce very different losses.
  • Management includes mitigation, preparation, response, and recovery.
  • Warnings need transport and shelter plans to work for everyone.
  • Defenses reduce risk but can bring costs and encourage more exposure.
4

Explain who lives in North America and why people move

Population maps show both crowded corridors and wide areas with few residents. Physical conditions influence these patterns, while transport, jobs, history, and government choices reshape them. North America’s living cultures reflect Indigenous societies, colonization, slavery, and later migration. Following movement within and between countries shows how family networks, work, and money link communities.

4.1 Where people live and why

A country may have a huge area and a small average density while most of its people live in crowded cities. To explain settlement, read both a country's total and the pattern inside it.

Calculate density and inspect distribution

Population distribution describes where people live. Population density divides population by area. Around 2025–2026, the United States had about 341.8 million people, Mexico about 130.9 million, and Canada about 41.8 million. Dates matter because populations change.

Using Canada's 41.8 million people and 3.86 million square miles gives about 11 people per square mile, or about 4 per km². The same method gives roughly 90 per square mile for the United States and 173 for Mexico. These averages spread each population across the whole country on paper. They do not describe the spacing between real homes.

Canada's vast northern lands lower its average. Most Canadians live in urban areas near the southern border. In 2021, about two-thirds lived within 62 miles (100 km) of the border with the lower 48 US states. About half live in the Quebec City–Windsor corridor along the St. Lawrence and Great Lakes. Nunavut covers roughly a fifth of Canada but has fewer than 50,000 residents.

Link physical conditions and human choices

Climate, relief, soil, and water affect settlement. Southern Canada has a longer growing season than the far north. Mexico's central plateau offers milder temperatures than tropical lowlands. Dry, mountainous parts of the US interior West support relatively few people, with large cities concentrated where water and jobs are available.

The Northeast, Great Lakes, Pacific coast, and parts of the South contain major US population concentrations. Mexican settlement clusters on the central plateau and in northern industrial cities. Coastlines and rivers often provide transport, but access becomes valuable when people build ports, railroads, and roads.

Chicago grew where the Great Lakes came close to the Mississippi river system. Later railroads made it a link between western farms and eastern markets. Its success depended on both geography and investment. Railroads also supported western towns; interstate highways later encouraged suburbs and freight hubs.

Using square kilometers instead gives about 35 people per km² for the United States and 67 for Mexico, compared with roughly 4 for Canada. Mexico is much smaller than Canada but has about three times its population. The continent as a whole has more than 600 million residents.

Account for population change

Population changes through natural change, births minus deaths, and net migration, arrivals minus departures. For a simple example, imagine a district with 5,000 births, 3,800 deaths, 2,100 arrivals, and 2,600 departures. Natural increase is 1,200 and net migration is −500, so the total increase is 700.

A place can therefore grow despite losing people through migration, or shrink despite having more births than deaths. Mexico's growth has slowed as family size has fallen. Migration has driven much of Canada's recent growth, so changing migration flows can quickly alter its growth rate. A good explanation names the process and the time period.

Mexico’s annual growth was about 0.7 percent in the 2025 figures, and its median age rose from 29 in 2020 to 32 in 2025. Canada’s growth was about 0.5 percent in the year to July 1, 2026. Slower growth can therefore reflect different processes: changing family size in one case and changing migration in another.

Key Takeaways

  • Density is an average; distribution shows the pattern within an area.
  • Canada’s population is concentrated near its southern border.
  • Physical conditions and transport investment work together.
  • Births minus deaths give natural change.
  • Arrivals minus departures give net migration.
  • Population change combines natural change and net migration.

4.2 Peoples, languages, and cultural landscapes

A language on a street sign or a place name on a map can reveal part of North America's history. These clues reflect Indigenous societies, colonization, forced migration, and later arrivals. The region's cultures continue to change today.

Recognize living Indigenous societies

Indigenous peoples lived across the continent for thousands of years before European colonization. Inuit communities developed ways of living in Arctic environments, while Maya and Aztec societies built cities in Mexico. Their descendants belong to many different nations with distinct languages, histories, and rights.

Canada recognizes First Nations, Inuit, and Métis as three groups of Indigenous peoples. About 1.8 million people identified as Indigenous in its 2021 census. The United States recognizes more than 570 tribes at the federal level. Mexico has millions of Indigenous-language speakers, including Nahuatl speakers. Indigenous identity and language use are related but are not identical measures.

Read the layers of history

Spain's conquest of the Aztec capital in 1521 spread Spanish rule and Catholicism. French settlement in Quebec began in 1608, while English settlement at Jamestown began in 1607. Disease, warfare, land seizure, and forced removal devastated Indigenous populations.

Enslaved Africans were forced across the Atlantic to work on plantations, especially in the Caribbean and American South. Their descendants shaped music, food, language, and politics. Slavery and later discrimination also shaped unequal access to land, housing, and wealth.

Spanish names such as Los Angeles and San Antonio show one historical layer. Montreal and Detroit show French influence. Toronto, Chicago, and Mississippi preserve Indigenous words. Together, buildings, signs, names, and land uses form the cultural landscape.

In Mexico’s 2020 count, 7.4 million people aged three and older spoke an Indigenous language, including about 1.65 million Nahuatl speakers. Mexico recognizes 68 Indigenous languages. These figures describe language use; Canada’s 5.0 percent Indigenous identity share in 2021 measures something different, so the percentages cannot be compared as if they counted the same thing.

Compare language and cultural change

English is the main language in most of Canada and the United States. A 2025 US executive order designated it the official US language. Canada has English and French as federal official languages; French is the main language in Quebec. Spanish is Mexico's main language, alongside many Indigenous languages. Hispanic or Latino communities form a large and diverse part of US society.

Christianity is the largest religion in all three countries, with Catholicism especially important in Mexico. Other religions include Judaism, Islam, Hinduism, Sikhism, and Buddhism. Many people identify with no religion.

Cultural convergence means cultures become more alike or share features. Tex-Mex food combines influences from Mexico and the United States. Cultural divergence means people maintain or strengthen differences; Quebec's protection of French is one example.

Locate power within countries

All three large countries are federal states, sharing power between national and regional governments. Canada has 10 provinces and 3 territories; the United States has 50 states and Washington, DC; Mexico has 31 states and Mexico City. Regional boundaries can reflect identity and negotiated rights. Nunavut's creation in 1999 recognized an Inuit-majority territory alongside a land-claims settlement.

Key Takeaways

  • Indigenous peoples are diverse, living communities.
  • Colonization and slavery shaped languages and unequal access to wealth.
  • A cultural landscape records history in visible features.
  • Convergence shares cultural features; divergence maintains differences.
  • Federal states divide power between national and regional governments.

4.3 Why people move and what changes

People move for work, family, safety, study, and many other reasons. A useful migration explanation follows both the journey and its effects on the places left behind and entered.

Separate direction from cause

Immigration is movement into a country; emigration is movement out. A person leaving Mexico for Canada is an emigrant from Mexico and an immigrant to Canada. Internal migration stays within one country.

Push factors encourage departure, including unemployment, conflict, discrimination, or drought. Pull factors attract people, including jobs, safety, schools, or family. One move can involve several factors. A job shortage can push a worker away while relatives and employment opportunities pull them toward a particular city.

Mass migration helped build the modern United States and Canada. Earlier waves came mainly from Europe; later waves included larger numbers from Asia and Latin America. Canada's 1967 points system made skills, education, and language part of immigrant selection. In the 2021 census, immigrants made up 23 percent of Canada's population.

US immigrants made up roughly 15–16 percent of the population in 2025. Mexico-born people were about 22 percent of US immigrants in 2023. The first percentage uses the entire US population as its base; the second uses immigrants only. Keeping the denominator clear prevents a large overestimate of the Mexican-born share of all residents.

Follow routes and networks

The Bracero Program brought Mexican workers to US farms from 1942 to 1964. Later, wage differences continued to attract workers north. Mexico is also a country of transit for people traveling through it and a destination where people settle. Calling it only a country people leave misses these roles.

Chain migration occurs when people follow relatives or neighbors who moved earlier. Earlier arrivals may help newcomers find work and housing. Communities from Oaxaca in Los Angeles illustrate how family links can connect one small origin area to part of a large city.

Flows change with policy and jobs. US net international migration fell between 2024 and 2025, while Canada's tighter temporary-resident policies slowed growth. A map needs a date: the main routes and their size can change.

Trace money and internal moves

Remittances are money migrants send home. Mexico received about 64.7 billion US dollars in 2024 and 61.8 billion in 2025. The 2.9 billion decline was about 4.5 percent using these rounded totals. Such payments support food, schooling, and housing, but leave families exposed to changes in jobs abroad.

Between 1910 and 1970, about six million Black Americans moved from the South to northern and western cities in the Great Migration. Racism pushed people out and industrial jobs pulled them in. The Dust Bowl pushed other families west in the 1930s. More recent internal flows include movement toward the Sun Belt and from Mexican villages to cities.

Explain different effects

Receiving places gain workers, skills, tax income, and cultural connections. Rapid growth can also strain housing and services. Sending places receive remittances but may lose young workers. Migrants include students, skilled professionals, farmworkers, and refugees with different legal situations. An explanation should identify the people and place involved instead of treating migration as one uniform experience.

Key Takeaways

  • Immigration and emigration describe the same move from different viewpoints.
  • Push and pull factors often act together.
  • Family networks help explain specific destinations.
  • Mexico is an origin, transit, and destination country.
  • Remittances connect migrant earnings to households elsewhere.
  • Internal migration has reshaped cities and economic regions.
5

Explain how cities grew, connect the world and divide people

Cities gather people and activities, but they also connect distant places through transport, finance, politics, and culture. Their boundaries affect population comparisons, while jobs and migration shape growth or decline. Within cities, housing prices, roads, public transit, and past discrimination affect access to opportunities. Reading a city means following both its outward networks and its neighborhood patterns.

5.1 Growing cities and urban regions

North America is highly urban: about four out of five people in Canada, the United States, and Mexico live in urban areas. Jobs pulled people toward cities, while machines reduced the number of workers needed on farms.

Compare the same kind of area

Urbanization is an increase in the share of people living in towns and cities. It differs from simple city growth. If both urban and rural populations grow at the same rate, the urban share stays unchanged.

A city's legal boundary may exclude much of its built-up area. A metropolitan area includes the city and surrounding places linked by work and commuting. New York City has about 8–9 million residents, while its metro area has about 20 million. Comparing one city's legal population with another's metro population gives a misleading ranking.

A megacity is an urban area with more than 10 million people. Mexico City, New York, and Los Angeles meet this threshold. A megalopolis is different: several metro areas form a large connected urban region. The Boston–New York–Philadelphia–Baltimore–Washington corridor is a classic example. Canada's Quebec City–Windsor corridor and the Los Angeles–San Diego–Tijuana region also show linked urban networks.

The Mexico City metro area had about 21.8 million people in 2020. Approximate metro sizes of 20 million for New York, 13 million for Los Angeles, 9 million for Chicago, and 7 million for Toronto show the region’s large urban scale. The Boston–Washington megalopolis had about 52 million people in 2010, so a linked urban region can be much larger than any one of its cities.

Explain growth and decline

Cities change when jobs, housing, transport, and migration change. Canada's largest cities have grown strongly through international migration. US Sun Belt cities attract people from other states, while Mexican cities expanded through rural migration and natural increase.

Detroit's city population fell from 1,849,568 in 1950 to 639,111 in 2020. First find the loss, 1,210,457. Divide this by the starting population and multiply by 100: about 65 percent. Phoenix grew from 106,818 to 1,608,139 over the same period, about 15 times its earlier population. Both examples use city limits, keeping the comparison consistent.

A shrinking city may have empty homes and fewer taxpayers. Maintaining roads and services becomes harder when fewer people pay toward a large existing network. A fast-growing city needs more homes, transport, schools, and water. Growth can create pressure even when it brings jobs and income.

Connect urban growth to physical limits

Phoenix has expanded in a desert. Its water comes from river systems, including the Colorado, and groundwater. Population growth raises demand while drought limits supplies. Solving this problem needs both water management and planning for how the city grows.

Mexico City expanded rapidly in a high basin. Pumping groundwater from beneath its old lake bed contributes to land sinking, damaging pipes and buildings. Surrounding mountains can also trap polluted air. The same physical setting that provided a mild highland climate creates problems as the city becomes larger.

An urban population figure tells you how many people are included within a boundary. To explain what growth means, also ask which jobs are changing, where newcomers settle, and which services or physical systems face pressure.

Key Takeaways

  • Urbanization concerns the urban share of the population.
  • Compare city limits with city limits, or metro areas with metro areas.
  • A megacity is one very large urban area; a megalopolis links several metro areas.
  • Shrinking cities lose tax income while growing cities need new services.
  • Water and ground conditions shape urban problems.

5.2 How world cities shape distant places

A city can influence distant places through decisions, money, information, and transport. A world city, or global city, is a major hub in these networks. Its importance comes from what it does and connects, as well as how many people live there.

Compare three world roles
CityImportant world rolesFeatures on the ground
New YorkFinance, diplomacy, media, and cultureBanks, stock exchanges, UN headquarters, major airports
Washington, DCPolitics, international lending, and diplomacyGovernment offices, embassies, World Bank, IMF
Los AngelesEntertainment, Pacific trade, and cultureStudios, port facilities, freight routes, migrant neighborhoods

New York's Atlantic harbor helped make it a gateway to Europe. Its financial and media decisions now reach far beyond that route. Washington influences trade, aid, and defense despite being smaller than many US cities. Los Angeles links film and entertainment with Asian trade through the Los Angeles–Long Beach port area.

Other cities have important roles too. Toronto is Canada's financial center, Chicago links commodity markets and transport, and Mexico City concentrates political, cultural, and business functions. A capital need not be the largest city, and a world city need not be a capital. Toronto's world role does not make it Canada's capital; that is Ottawa.

Explain why businesses cluster

A cluster is a concentration of linked firms and institutions. Firms benefit from nearby workers, suppliers, customers, and ideas. Financial companies in Lower Manhattan can hire experienced workers and meet specialist advisers. Film companies around Hollywood can draw on crews, studios, and other services.

Follow the process: an established group of firms creates a pool of skills; that pool attracts new firms; the new firms create more opportunities. These advantages help explain why activities remain concentrated even when communication is possible online. High rents and competition for workers can also raise costs.

Follow routes through a hub

A hinterland is the area served by a port or city. Railroads, roads, warehouses, and waterways connect the center to this area. A port's importance depends partly on how well goods can reach inland customers.

In a hub-and-spoke network, smaller routes feed a central transfer point. A passenger may fly from a small city to Chicago and transfer to Europe. Airlines can gather enough passengers for a long-distance flight, while travelers from small places gain access to more destinations. A delay at the hub can spread through many connected routes.

Notice the workers behind global functions

World cities need cleaners, cooks, delivery workers, and care workers as well as bankers and executives. Global firms bring high incomes and demand for expensive housing. Lower-paid workers may face long commutes or crowded homes. Migrant communities connect these cities to other countries through family, businesses, culture, and money.

Key Takeaways

  • World-city importance comes from functions and connections.
  • New York, Washington, and Los Angeles have different mixes of global roles.
  • Clusters share workers, suppliers, and ideas.
  • Hubs collect and redistribute passengers or freight.
  • High-paid global work depends on many lower-paid services.

5.3 City structure and unequal access

City structure records choices about land, transport, housing, and who can live where. A simple center-to-suburb model helps locate activities, but real neighborhoods change and often have more complicated patterns.

Read the main zones

The Central Business District, or CBD, contains concentrated offices, shops, and public buildings. High demand for central land encourages tall buildings and intensive use. Around it, the inner city often contains older housing, former industry, and transit lines. Suburbs extend farther out with housing and shopping areas.

Cars and highways allowed many households and businesses to move outward after the 1940s. Urban sprawl is the spread of low-density development into surrounding land. It offers space but increases travel distances, car use, and the cost of roads, pipes, and other services.

An edge city is an outer concentration of offices and shops, often near highway junctions. Tysons near Washington is an example. Los Angeles has several strong centers, making it a polycentric city. The old downtown is therefore not the only place where work and shopping concentrate.

Explain neighborhood change

Gentrification occurs when wealthier residents and investment enter a lower-income neighborhood. Buildings may improve and new businesses open. Higher rents can then push out long-time residents. The same change can improve the area while reducing access for people who lived there before.

Segregation means groups live separately. It can result from income differences, discrimination, and housing rules. In US history, redlining and discriminatory lending restricted investment and access to loans in Black neighborhoods. Restrictive property agreements and violence excluded families from many white suburbs. These barriers influenced homeownership, wealth, and access to schools and jobs across generations.

An ethnic neighborhood can offer familiar language, shops, services, and family networks. An area described as a ghetto involves concentration under strong constraints such as poverty and discrimination. Treating every ethnic neighborhood as forced separation overlooks residents' choices and support networks.

In parts of Los Angeles, past limits on home purchases, unequal local wealth, outward-moving jobs, and weak transit links reinforced each other. Limited housing choice can place a household far from good jobs; poor transport then makes it harder to gain the income needed to move. Several linked barriers can preserve a pattern long after one rule changes.

Connect income, housing, and transport

Social polarization is a widening gap between rich and poor. Global finance and technology jobs can grow alongside low-paid delivery, cleaning, and care work. Rising housing costs push some workers outward, while jobs may be hard to reach without a car. Informal work, such as some street selling and day labor, can provide income without the protections of formal employment.

Gated communities make separation visible through walls and controlled access. Mexico City's wealthy western districts contrast with many poorer settlements on its edges. Some self-built housing occupies slopes or former lake beds, adding physical risk.

Patterns are not fixed. Inner-city districts can become expensive through gentrification, and suburbs can contain poverty. Use neighborhood data on income, housing, and transport before assuming that all central areas are poor or all outer areas wealthy.

Key Takeaways

  • The CBD concentrates activities that compete for central land.
  • Sprawl spreads development and increases transport and service demands.
  • Edge cities create major centers outside downtown.
  • Gentrification can improve buildings while displacing residents.
  • Segregation reflects both present costs and past discrimination.
  • Neighborhood patterns need local evidence.
6

Explain how North America earns its living and connects with the world

Farms, resources, factories, and services form regions with different needs and links. Climate and soil influence production, while water, workers, technology, and markets shape what becomes profitable. Goods and parts move through supply chains that cross borders repeatedly. Trade agreements, ports, and transport routes help these movements, and development measures reveal how unevenly the gains are shared.

6.1 Why farming regions differ

North America's farms range from large mechanized businesses to small plots feeding families. Climate and soil matter, but farmers also need water, transport, workers, and customers. Together these factors explain the main farming regions.

Connect products to conditions

Commercial farming produces crops or livestock for sale. Agribusiness links farming with seed, machinery, processing, distribution, and retail companies. Large machines allow a small workforce to cultivate huge areas. Agriculture employs a much smaller share of workers in the United States and Canada than in Mexico.

RegionHelpful conditionsCommon products
Corn BeltDeep soils, summer warmth, enough rainCorn and soybeans, often for animal feed
Great Plains and Canadian PrairiesBroad fields and drier conditionsWheat and cattle
Great Lakes areaFeed, water, and nearby customersDairy products
Warm southern United StatesLong warm seasonCotton, rice, and other crops
California Central ValleySunny summers and supplied waterFruit, nuts, and vegetables

Farming belts summarize dominant patterns. They do not mean that every farm grows the same crop. Moving west across the Plains generally brings less rainfall. Around 20 inches (500 mm) per year is a rough guide to where rain-fed cropping becomes harder, though crop choice, soils, and the timing of rain matter too. Drier areas use grazing, dry-farming methods, or irrigation.

Only about 1.5 percent of US workers and 1 percent of Canadian workers work in agriculture, compared with roughly 11 percent in Mexico. These are employment shares, not shares of land or food production. Heavy mechanization helps explain why large output can require few workers.

Follow water and market links

California's Mediterranean climate has long, dry summers. Mountain water stored and moved through canals allows intensive farming during the sunny growing season. Refrigerated trucks then carry fresh produce to distant markets. Favorable sunshine alone would not supply the water or deliver the harvest.

Northern and western Mexico have large irrigated export farms. Michoacán is especially important for avocados. Many small farms in southern Mexico grow corn and beans partly for household use, including on community lands called ejidos. Winter produce exports serve northern customers when their own fields cannot supply the same crops.

Weigh the costs

The High Plains, or Ogallala, aquifer supplies irrigation across parts of eight US states. Water is pumped faster than it is replaced in many areas. The average water level fell about 16.5 feet between around 1950 and 2019, with much larger local declines. A region can produce abundant food today while reducing its future water supply.

Fertilizer washed from fields enters streams and the Mississippi. It promotes algae in the Gulf of Mexico; decay then removes oxygen and helps create a seasonal dead zone. Income from farming and environmental costs can fall on different groups, including distant fishers.

Large-scale farming supplies affordable food and supports processing and transport jobs. It can also concentrate control, increase chemical and fuel use, and put pressure on small farms and low-paid workers. Evaluate a farming region by following both its inputs and its effects beyond the farm.

Key Takeaways

  • Farming location combines physical conditions, water, and markets.
  • Mechanization allows large output with few farmworkers.
  • Dry summers can support productive farming when irrigation is available.
  • Pumping can reduce future groundwater supplies.
  • Fertilizer runoff can harm waters far downstream.

6.2 Resources, energy, and boom-and-bust regions

A natural resource becomes economically useful when people can extract, process, and transport it. Its location can create jobs and trade, but ownership, prices, and environmental damage shape who benefits.

Distinguish renewable and nonrenewable resources

Oil, coal, and metal ores are nonrenewable on human timescales. Forests and fish are renewable only when harvesting allows stocks to recover. Flowing water can provide renewable electricity, though a dam changes the river and surrounding land.

Canada's oil production is concentrated in Alberta, including oil sands containing heavy oil mixed with sand. In 2024, Canada exported about 4.2 million barrels of crude oil daily, with about 95.7 percent going to the United States. The rounded volumes give only an approximate share. Pipelines connect production with buyers, bringing income while creating dependence on one main market.

The United States is the world's largest oil producer. Fracking helped expand shale production, including in the Permian Basin of Texas and New Mexico. Coal fields lie in Wyoming and Appalachia, while wind and solar power have expanded, especially in states such as Texas and California. Mexico's major oil areas lie in and around the Gulf of Mexico. Pemex, the state company, has played the central role since nationalization in 1938; declining older fields have reduced output over time.

Connect water, minerals, and industry

Hydroelectric power provides more than half of Canada's electricity. Quebec's large dams supply Canadian cities and some northeastern US customers. Dams generate low-carbon electricity but flood land, change water flows, and affect ecosystems and Indigenous communities. James Bay projects led to disputes and agreements involving Cree and Inuit rights.

Canada mines nickel near Sudbury, iron ore in Labrador, and potash in Saskatchewan. Potash supplies fertilizer, linking mines to food production. Mexico is a major silver producer. Using 2025 rounded figures, Canada supplied about 31 percent of world potash and Mexico about 24 percent of world silver.

Potash figures use a common potassium-content measure called potassium oxide (K₂O) equivalent. On that basis, Canada’s 2025 output was about 15 million of 49 million metric tons worldwide. Dividing 15 by 49 gives about 31 percent. Mexico’s silver output was about 6,300 of 26,000 metric tons, about 24 percent. Both were the largest national shares of their respective resources, but their economies extend far beyond these products.

Explain a resource town's risks

A town centered on a mine, mill, or oil field can grow quickly when demand and prices rise. Shops, housing, and public income expand with the industry. If prices fall, the resource runs out, or production closes, jobs and customers disappear. This boom-and-bust cycle makes dependence on one activity risky.

Renewable resources can also be depleted. Overfishing caused severe decline in Newfoundland cod stocks and a major closure in 1992. Thousands of workers lost their livelihoods, showing that renewable does not mean unlimited.

Resource development can create conflict over land rights, water, waste, and emissions. Oil sands leave disturbed land and tailings ponds; burning oil adds greenhouse gases. A fair comparison considers jobs, public revenue, environmental costs, and Indigenous rights. Resource wealth alone does not determine living standards: taxation, ownership, and investment in schools and other industries affect how widely benefits are shared.

Key Takeaways

  • Resources need workable extraction and transport links.
  • Renewable resources can be depleted through overuse.
  • Alberta’s oil trade is heavily tied to US buyers.
  • Hydroelectric dams offer low-carbon power with land and river costs.
  • Dependence on one resource creates boom-and-bust risk.
  • Ownership and public investment affect how resource income is shared.

6.3 From manufacturing belts to new clusters

Economic regions change as technology, transport, and business needs change. Coal and water routes once drew heavy industry together. Skilled workers, research, investment, and access to markets now help explain many growing industries.

Connect sectors and location factors

The primary sector extracts raw materials. The secondary sector makes goods. The tertiary sector supplies services, while the quaternary sector involves knowledge and research. As economies develop, a larger share of workers usually enters services. Fewer factory workers do not necessarily mean less factory output: machines can produce more with fewer people.

Businesses consider resources, energy, workers, transport, land costs, markets, and rules. The weight of each factor changes. A steel mill needs heavy inputs and cheap freight. A software firm depends more on skills, networks, and investment.

Explain the Manufacturing Belt and Rust Belt

The Manufacturing Belt developed around the Great Lakes and Northeast from the 1800s. Coal from Appalachia and iron ore from the Lake Superior region could meet through water and rail routes. Steel and car production linked cities such as Pittsburgh, Cleveland, Detroit, and southern Ontario's industrial centers.

From the 1960s and 1970s, factory closures and lost jobs brought the name Rust Belt. Foreign competition, automation, older plants, and relocation all contributed to deindustrialization. Job losses reduced household spending and tax income. Pittsburgh later developed hospitals, universities, and robotics, showing how a region can build new activities from existing skills and institutions.

US service employment now accounts for about four out of five jobs. This does not mean factories have vanished: services grow both for consumers and around production, including finance, research, freight, and business support. A manufacturing region can lose factory jobs while retaining or developing linked service work.

Explain newer growth regions

The Sun Belt extends across the South and Southwest. Warm winters, air-conditioning, cheaper land, and business conditions attracted people and firms. Energy, aerospace, logistics, and technology grew around cities such as Houston, Dallas, Atlanta, and Phoenix.

Silicon Valley developed through linked advantages: Stanford supplied skills and research, military demand supported early electronics, and investors financed risky projects. Successful firms attracted more talent and suppliers. The resulting cluster shares ideas but also faces high housing costs. Other technology centers include Seattle, Austin, and Toronto–Waterloo.

Canada has several specialized regions: Toronto in finance, Montreal in aerospace and games, Alberta in energy, and southern Ontario in cars. Ontario and Michigan factories are closely linked across the border.

Connect Mexico to wider production

Maquiladoras assemble imported parts for export. Since 1965, many have developed near the US border, including Tijuana and Ciudad Juárez. Lower labor costs and nearby US customers attract investment, while jobs and urban growth increase demand for water and housing.

The Bajío has become a major car-making region, and Monterrey concentrates heavy industry and business. Tourism creates another economic pattern, including Cancún's beach resort growth. Explaining factory job losses only through foreign workers misses automation and changing technology as well as firms' decisions about where to invest.

Key Takeaways

  • Economic sectors describe different kinds of work.
  • Location factors change with technology and markets.
  • The Great Lakes belt grew through resources and transport.
  • Deindustrialization has several causes, including automation.
  • Technology clusters share skills, research, and investment.
  • Mexican manufacturing links lower costs with nearby markets.

6.4 Trade across neighboring borders

A car may cross a border several times before a customer buys it. North American trade connects farms, mines, factories, and consumers across Canada, the United States, and Mexico. Border rules affect the whole chain.

Understand the agreement

An import is bought from another country; an export is sold to one. A tariff taxes imports. A free trade agreement reduces trade barriers between its members. NAFTA began in 1994 and was replaced on July 1, 2020, by USMCA, called CUSMA in Canada and T-MEC in Mexico. The agreement added rules covering cars, labor, and digital trade.

At the July 1, 2026 joint review, the United States did not agree to renew the agreement in its current form. It remained in force. Without agreement on extension, yearly reviews follow and the existing term runs to July 1, 2036. Uncertainty about future rules can delay investment in new factories.

Rules of origin decide whether products qualify as regional goods. Passenger vehicles and light trucks face a 75 percent regional value-content requirement using the net cost method. Other rules also cover labor value and steel and aluminum sourcing.

For a simplified calculation, take a car with a net cost of 30,000 US dollars and outside-region materials worth 6,000. Subtract the outside amount to get 24,000, then divide by 30,000: the regional share is 80 percent. It passes this content test. With 9,000 of outside materials, the regional share is 70 percent, which fails. Passing this one test is not the same as meeting every rule or avoiding every tariff.

Follow goods through a supply chain

A supply chain follows production from materials to the buyer. Wiring made in Mexico, an engine made in Ontario, and seats made in Michigan may enter the same car. Each factory specializes and depends on timely deliveries from the others. A delay at a border can stop assembly even where workers and machinery are ready.

Laredo handled about 354 billion dollars in trade in 2025, and trucks carried about three-quarters of US-Mexico goods trade by value. A crossing can therefore serve businesses far beyond its own city. Detroit–Windsor similarly links Canadian and US factories through bridges, customs facilities, highways, and railroads.

Read the trade figures

In 2025, rounded US goods exports to Mexico were 337 billion dollars and imports 534 billion. Exports minus imports gives a deficit of 197 billion. Canada-US trade was also large: about 334 billion in US exports and 382 billion in imports.

A deficit describes flows; it does not by itself show that a country lost money overall. Imports include useful goods and factory inputs. Consumers may gain lower prices and exporters larger markets, while some workers and firms face harder competition. Since 2025, extra US tariffs on some products have complicated regional trade.

Key Takeaways

  • Imports enter a country; exports leave it for buyers abroad.
  • USMCA replaced NAFTA in 2020 and remained in force after the 2026 review.
  • Rules of origin determine regional eligibility.
  • Supply chains make factories depend on border reliability.
  • Trade balance is exports minus imports.
  • Trade benefits and costs differ between groups.

North America connects to the wider world through products, investment, people, media, and technology. These links create opportunities and dependencies. Their benefits differ between countries and within them.

Distinguish ways of organizing work

Globalization is the growth of links between places. Offshoring moves work to another country. Outsourcing pays another firm to do work. Nearshoring moves work to a nearby country. A company can offshore work to its own foreign factory without outsourcing it, or outsource work to a supplier in its own country.

Moving production from China to Mexico to serve US customers is nearshoring. It can shorten journeys and bring factories closer to buyers. Mexican factories may still import Asian parts, so a regional factory is part of a wider global chain.

Trace routes beyond the continent

Pacific ports such as Los Angeles–Long Beach, Vancouver, and Manzanillo connect to Asia. Atlantic ports such as New York–New Jersey and Halifax connect to Europe. Containers transfer between ships, railroads, and trucks, linking distant suppliers to inland customers.

The Panama Canal connects Atlantic and Pacific routes, avoiding the long journey around South America. It opened in 1914 and expanded in 2016. Its locks depend on fresh water. During the 2023 drought, low lake levels forced traffic restrictions. Fewer daily passages led to queues and higher shipping costs, showing how rainfall far from a buyer can affect its deliveries.

People also connect regions. Migration supports family visits, businesses, and remittances. Tourism creates jobs in Mexico and the Caribbean while increasing dependence on distant visitors. US films, music, brands, and technology reach global audiences. New York hosts the United Nations; the United States and Canada belong to NATO and the G7, while all three large countries belong to the G20.

Compare development with more than income

GDP per person divides a country's output by its population. It gives an average, not the income of every resident. The Human Development Index, or HDI, also draws on health and education. In the 2025 report using 2023 data, HDI was 0.939 for Canada, 0.938 for the United States, and 0.789 for Mexico. A small difference in income rankings need not match a broader development ranking.

Large internal gaps exist. Southern Mexican states such as Chiapas and Oaxaca generally have lower living standards than the north and Mexico City. Parts of Appalachia and some US reservations face high poverty. Many First Nations and Inuit communities in Canada lack housing and services available elsewhere.

Wage differences across the US-Mexico border help attract factories toward lower-cost production and workers toward higher wages. Remittances link the resulting incomes back to families. The continent also includes much poorer countries such as Haiti. To describe development fairly, name the location, date, and measure instead of calling the whole continent rich.

Key Takeaways

  • Offshoring changes country; outsourcing changes who does the work.
  • Nearshoring moves work closer to its buyers.
  • Ports and inland routes connect regional and global supply chains.
  • Canal drought can spread delays through world trade.
  • HDI combines health, education, and income.
  • Country averages hide important internal inequalities.

North America Regions examples

6 Walkthroughs

1

Build a physical picture of North America

13 steps
Place the region, cross its landscapes, and follow an inland shipping route.
  1. 1
    IntroductionStart with three kinds of map

    A political map shows countries. A physical map shows landforms and water. A regional map groups places for a purpose, such as comparing culture or trade.

    Use these views together. Mexico can belong to both North America and Latin America, while a shipping route can connect places on opposite sides of a border. The map you choose should help answer the question you are asking.

  2. 2
    ExplanationSet the continental frame

    Find Canada, the United States, and Mexico, then continue south through Central America to Panama. Add the Caribbean islands and Greenland. These places form North America geographically.

    The Arctic, Atlantic, and Pacific oceans surround its northern, eastern, and western sides. The long reach from the Arctic toward the tropics helps explain its wide range of environments.

  3. 3
    ExampleSeparate location and government

    Greenland lies geographically in North America, but belongs to the Kingdom of Denmark. Hawaii is a US state, but lies far out in the Pacific.

    In each case, ask two questions: “Where is the land?” and “Which government does it belong to?” The answers describe different features. The same distinction helps when Mexico is grouped geographically with North America and culturally with Latin America.

  4. 4
    ChallengePlace Mexico in two regions

    A student says, “Mexico cannot be Latin American because it is in North America.” What would you explain?

    ---reveal---

    The two labels use different features. North America names the continent; Latin America groups places through language and history. Mexico belongs to both, so the cultural grouping does not change its continental location.

  5. 5
    ExplanationTravel from west to east

    Start at the Pacific and cross the Western Cordillera, including coastal ranges and the inland Rockies. Beyond them lie the Interior Plains. To the north, the Canadian Shield curves around Hudson Bay. Farther east lie the Appalachians and low coastal plains.

    The Rockies are one part of the western mountain system. Several other ranges stand between them and the Pacific.

  6. 6
    ExampleMatch land to work

    Compare two landscapes. The Interior Plains have broad fields, gentle relief, and deep soils. Large farms can use machinery across extensive areas.

    The Canadian Shield has old exposed rock, thin soil, forests, lakes, and mineral deposits. Farming is harder, while mining, forestry, and hydroelectricity are important. Different kinds of wealth come from different physical conditions.

  7. 7
    ChallengeChoose a route through the landscapes

    A west-to-east journey crosses high mountain ranges, broad farming plains, and then older, lower mountains. Name the likely sequence.

    ---reveal---

    Western Cordillera, Interior Plains, and Appalachians. The Canadian Shield lies mainly farther north around Hudson Bay. The sequence also shows why calling all western mountains “the Rockies” leaves out much of the mountain system.

  8. 8
    ExplanationLet the slope guide the river

    A drainage basin gathers water into one river system. Tributaries join the main river, while high ground separates neighboring basins.

    The Continental Divide follows high terrain through the Rockies. Water west of it generally drains toward the Pacific. Water east of it can reach the Atlantic, Gulf of Mexico, or Arctic. Northward flow is possible wherever the land slopes north.

  9. 9
    ExampleFollow grain from Lake Superior

    Imagine grain loaded at Duluth on Lake Superior. The ship passes through the Soo Locks into Lake Huron. It then follows the St. Clair River, Lake St. Clair, and Detroit River to Erie.

    This route links inland farming to ports and distant buyers. The next obstacle is not a national border but a sharp change in water level between Erie and Ontario.

  10. 10
    ExampleGet past the waterfall

    Niagara Falls blocks a direct ship route between Erie and Ontario. The Welland Canal goes around it, using locks to change the ship’s water level in stages.

    After reaching Ontario, the ship continues through the St. Lawrence system toward the Atlantic. The example connects three ideas: a natural drainage route, a barrier to navigation, and engineering that creates a trade route.

  11. 11
    ChallengeProtect a shared route

    A spill enters a river upstream of a border. Downstream towns in another country use the river for water and shipping. Why is joint action useful?

    ---reveal---

    The water carries the problem across the border. Downstream users cannot remove the upstream cause by acting alone. Shared monitoring and pollution rules connect the whole drainage system with the governments responsible for different stretches.

  12. 12
    ChallengeConnect landscape and trade

    A farming region lies beside navigable lakes linked by canals to an ocean. Explain two ways its setting can support exports.

    ---reveal---

    The land can supply crops for sale, while the lakes and canals provide a route to ocean ports and overseas buyers. Both production conditions and transport matter. Fertile land without a workable route would face a different cost and market problem.

  13. 13
    RecapRead a region through its connections

    Check a map in this order: identify the grouping, locate the main landforms, and follow water toward its outlet. Then connect physical conditions with human use.

    A continent can contain several cultural regions. A river can link several countries. Mountains, soils, canals, and ports help explain why a particular place becomes a farming center, resource region, or trade route.

2

Explain a climate from its location and graph

11 steps
Work through coastal influence, temperature range, mountain rainfall, and climate zones.

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  1. 1
    IntroductionAsk why two places differ
  2. 2
    ExplanationSeparate short events from long patterns
  3. 3
    ExampleFind the coastal range
  4. 4
    ExampleHandle a negative winter mean
  5. 5
    ExplanationFollow air over a mountain
  6. 6
    ChallengeExplain a matched pair
  7. 7
    ExplanationConnect climate and vegetation
  8. 8
    ExampleRead the rainfall season
  9. 9
    ChallengeDistinguish two coastal climates
  10. 10
    ChallengeExplain a tropical highland
  11. 11
    RecapBuild a complete climate explanation
3

Follow a hazard from cause to response

16 steps
Compare plate movement, storms, drought, fire, and the choices that reduce harm.

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  1. 1
    IntroductionSeparate the event from its impact
  2. 2
    ExplanationCompare sideways motion and sinking plates
  3. 3
    ExampleExplain unequal shaking within a city
  4. 4
    ChallengeChoose the explanation for damage
  5. 5
    ExplanationRead the approaching front
  6. 6
    ExampleFollow heat into a hurricane
  7. 7
    ChallengeUse more than the category
  8. 8
    ExplanationTurn drought into a cause chain
  9. 9
    ExplanationConnect fuel, ignition, and spread
  10. 10
    ChallengeAddress cause and consequence
  11. 11
    ExplanationIdentify the people at risk
  12. 12
    ExampleMove through the management cycle
  13. 13
    ChallengeMake a warning usable
  14. 14
    Key InsightCheck what a defense changes
  15. 15
    ChallengeCompare a combined plan
  16. 16
    RecapExplain risk in connected steps
4

Read population patterns and migration links

12 steps
Use density, cultural evidence, and migration flows to explain where and how people live.

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  1. 1
    IntroductionLook inside the national average
  2. 2
    ExampleCalculate density
  3. 3
    ExplanationExplain southern Canada’s concentration
  4. 4
    ChallengeCombine two population processes
  5. 5
    ExplanationRead a cultural landscape
  6. 6
    ExampleCompare sharing and maintaining differences
  7. 7
    ChallengeInterpret signs without overgeneralizing
  8. 8
    ExplanationName the same move from both ends
  9. 9
    ExampleFollow a family network
  10. 10
    ConnectionFollow money back home
  11. 11
    ChallengeConnect a destination to its origin
  12. 12
    RecapDescribe the pattern, then explain it
5

Read a city beyond its skyline

12 steps
Compare urban populations, global functions, and unequal access within neighborhoods.

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  1. 1
    IntroductionChoose the right scale for the city
  2. 2
    ExampleCompare matching populations
  3. 3
    ExplanationDistinguish size from a linked region
  4. 4
    ChallengeRecognize urbanization
  5. 5
    ExplanationCompare world-city functions
  6. 6
    ExampleWatch a cluster reinforce itself
  7. 7
    ChallengeExplain a smaller city’s influence
  8. 8
    ExplanationFollow the city outward
  9. 9
    ExampleFollow investment into housing
  10. 10
    ExplanationConnect history with present access
  11. 11
    ChallengeConnect global success and local pressure
  12. 12
    RecapRead functions and access together
6

Follow a product through the regional economy

19 steps
Connect farms, resources, changing industries, cross-border production, and global development.

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  1. 1
    IntroductionStart with a product and trace its needs
  2. 2
    ExplanationMatch farms to conditions
  3. 3
    ExampleTrace a water cost beyond the farm
  4. 4
    ChallengeProtect a future water supply
  5. 5
    ExplanationConnect resources to buyers
  6. 6
    ExampleFollow a town through a downturn
  7. 7
    ChallengeJudge a renewable project
  8. 8
    ExplanationExplain an old industrial location
  9. 9
    ExampleBuild a newer cluster
  10. 10
    ChallengeSeparate jobs from output
  11. 11
    ExplanationIdentify a cross-border chain
  12. 12
    ExampleCalculate a regional share
  13. 13
    ExampleDistinguish total trade from balance
  14. 14
    ChallengeRespond to changing trade rules
  15. 15
    ExplanationSeparate three business decisions
  16. 16
    ConnectionFollow a distant rainfall shortage
  17. 17
    ChallengeCompare development measures
  18. 18
    ChallengeConnect work, trade, and households
  19. 19
    RecapAsk who gains and who depends on whom

North America Regions practice questions

60 Practice Questions in 6 sets

Set 1: Read regions, landscapes, and climates10 Practice Questions

Question 1 of 10

Why can a high city in tropical Mexico be cooler than nearby lowlands?
  1. High cities lie beyond the Tropic of Cancer.
  2. Higher ground receives much weaker sunlight.
  3. Temperature generally decreases with elevation.
  4. Tropical latitudes have cold winters everywhere.
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Answer: C
Air temperature generally falls as elevation increases, so tropical highlands can be mild while nearby lowlands are hot. Latitude alone does not fix a place’s temperature. A high city does not have to lie outside the tropics for height to produce this cooling effect.

Question 2 of 10

A coastal station has mild, rainy winters and warm, very dry summers. What climate and summer farming need fit this pattern?
  1. Mediterranean climate with irrigation.
  2. Tropical climate with year-round rainfall.
  3. Marine west coast climate with drainage.
  4. Humid continental climate with snow storage.
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Answer: A
Wet winters and dry summers identify a Mediterranean pattern, found in coastal California. Crops growing through the dry season often need irrigation. Marine west coast climates can also have mild winters, but the strong summer drought is the more useful clue here.

Question 3 of 10

What continent contains Panama?
  1. South America
  2. A separate Central American continent
  3. North America
  4. North and South America
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Answer: C
Panama belongs to North America, whose southern land boundary meets Colombia in South America. Central America is a subregion within North America. Treating it as a separate continent confuses a smaller regional grouping with the larger continent that contains it.

Question 4 of 10

A geography map places Mexico in North America, while a language map places it in Latin America. How can both be correct?
  1. They group the same place by different features.
  2. They use different political borders for Mexico.
  3. They show Mexico before and after a border change.
  4. They separate Mexico’s northern and southern halves.
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Answer: A
The continent grouping follows geography, while Latin America groups places through language and history. A place can therefore belong to both. The two labels do not mean Mexico has moved or that the maps disagree about its national boundary.

Question 5 of 10

Which landform region forms a broad area of ancient rock around Hudson Bay?
  1. The Interior Plains
  2. The Atlantic Coastal Plain
  3. The Western Cordillera
  4. The Canadian Shield
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Answer: D
The Canadian Shield curves around Hudson Bay and contains very old exposed rock. Its thin soils and many lakes reflect the effects of past ice sheets. The Interior Plains also cover a large area, but their broad sediment layers and deeper soils create a different landscape.

Question 6 of 10

A planner needs a large farming area with deep soils and gently rolling land in central North America. Which region best fits?
  1. The Canadian Shield
  2. The Arctic tundra lowlands
  3. The Interior Plains
  4. The Pacific Coast Ranges
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Answer: C
The Interior Plains combine broad fields, deep soils, and relatively gentle relief, making large-scale farming practical. The Canadian Shield may look like another extensive interior region, but much of it has thin soils and exposed rock that limit crop farming.

Question 7 of 10

A ship traveling from Lake Erie to Lake Ontario must avoid a major waterfall. Which route allows it to do this?
  1. The Detroit River
  2. The Welland Canal
  3. The Mississippi River
  4. The Soo Locks
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Answer: B
The Welland Canal bypasses Niagara Falls between Erie and Ontario, using locks to manage the height change. The Soo Locks also solve a Great Lakes navigation problem, but they link Superior with the Huron system and would not bypass this waterfall.

Question 8 of 10

Before withdrawals, a shared river carries 100 million m³ a year. Drought reduces that natural flow by 25 percent. The upstream country withdraws 40 million m³, while the downstream country needs 40 million m³. What reaches the downstream country, and what minimum combined reduction in demand would balance these uses?
  1. 35 million m³ arrives; demand must fall by 5 million m³.
  2. 60 million m³ arrives; demand needs no reduction.
  3. 35 million m³ arrives; demand must fall by 25 million m³.
  4. 75 million m³ arrives; demand needs no reduction.
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Answer: A
Drought reduces natural flow to 75 million m³, and the upstream withdrawal leaves 35 million for a downstream need of 40 million. The combined shortage is 5 million m³, which users must share through reduced demand. The 25 million drought loss is not the same as the remaining shortage after both needs are counted.

Question 9 of 10

Two stations at similar latitudes have monthly temperature extremes of 21°C and −9°C, and 17°C and 5°C. Which is more likely to be inland?
  1. The second station, with a 12°C annual range.
  2. The first station, with a 30°C annual range.
  3. The first station, with a 12°C annual range.
  4. The second station, with a 22°C annual range.
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Answer: B
The first range is 21 minus −9, or 30°C; the second is 17 minus 5, or 12°C. Inland places usually have larger seasonal ranges at similar latitudes. Treating the negative winter mean as positive would incorrectly reduce the first range to 12°C.

Question 10 of 10

A moist wind crosses a coastal mountain range from west to east. Two farms lie at the same latitude and elevation, one on each side. Which rainfall pattern and cause are most likely?
  1. Both are equally wet because their elevations match.
  2. The western farm is drier because rising air warms.
  3. The eastern farm is wetter because descending air cools.
  4. The western farm is wetter because air rises there.
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Answer: D
Air rising on the western windward slope cools and releases precipitation. After crossing the crest, it descends and warms, leaving the eastern farm in a rain shadow. Equal latitude and elevation do not remove the mountain barrier’s effect on air movement and moisture.
Set 2: Explain hazards and compare protection10 Practice Questions

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Question 1 of 10

A coastal town sees a hurricane drop from Category 3 to Category 1 while heavy rain continues and coastal water keeps rising. How should it interpret the change?
  1. All hazards have weakened by the same proportion.
  2. Wind has weakened; flooding can still be dangerous.
  3. Rain has weakened; wind remains at Category 3 strength.
  4. The storm surge must fall as soon as the category falls.
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Question 2 of 10

During a drought, bare fields lose much more soil to wind than nearby grassland. Why?
  1. Bare fields become wetter as their crops disappear.
  2. Plowing removes the wind from the surface layer.
  3. Grass roots and cover help hold soil in place.
  4. Grassland receives more rain during every drought.
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Question 3 of 10

A city replaces diesel buses with low-emission electric buses and adds shaded cooling shelters. How do the two actions address climate change?
  1. Buses support mitigation; shelters support adaptation.
  2. Buses support adaptation; shelters support mitigation.
  3. Both actions are adaptation because they occur in cities.
  4. Both actions are mitigation because they aid travelers.
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Question 4 of 10

Two towns face similar flood depths. One has strong homes but many residents without cars; the other has weak homes but free evacuation buses. What is the best assessment?
  1. The second town has no vulnerability because buses are free.
  2. The first town has no vulnerability because homes are strong.
  3. Their flood depths prove that their losses will be equal.
  4. Both have vulnerabilities that need different measures.
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Question 5 of 10

A town restores electricity and rebuilds damaged houses several months after a hurricane. Which management stage is this?
  1. Immediate response
  2. Forecasting
  3. Recovery
  4. Preparation
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Question 6 of 10

A tornado warning reaches a school. What does it mean?
  1. Conditions are favorable, so stay ready to shelter.
  2. Danger is occurring or expected, so shelter now.
  3. Only wind damage is expected, so avoid travel.
  4. A tornado was possible earlier, so resume normal activity.
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Question 7 of 10

What plate movement occurs along the San Andreas Fault?
  1. Two plates move apart and open a gap.
  2. Plates slide sideways past each other.
  3. One plate sinks under the other.
  4. Two continental plates push straight together.
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Question 8 of 10

An earthquake damages a district on soft lake sediment more than a nearby district on firm rock. What best explains the difference?
  1. The firm rock released no energy.
  2. A different plate moved under the rock.
  3. The sediment raised the magnitude.
  4. The sediment amplified the shaking.
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Question 9 of 10

What do blue triangles on a standard weather-map front indicate?
  1. A cold front
  2. A high-pressure center
  3. A warm front
  4. A low-pressure center
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Question 10 of 10

Cold west winds cross a warmer Lake Ontario. Which shore is most likely to receive lake-effect snow?
  1. Both shores equally, regardless of wind
  2. The western, upwind shore
  3. The eastern, downwind shore
  4. The shore closest to the equator
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Set 3: Connect population, movement, and cities10 Practice Questions

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Question 1 of 10

A district has 240,000 people and an area of 4,000 km². What is its average population density?
  1. 240 people per km²
  2. 600 people per km²
  3. 6 people per km²
  4. 60 people per km²
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Question 2 of 10

A country has low average density but most residents live in three large cities. What should a settlement map show?
  1. Dense settlement spread evenly throughout the country.
  2. Dense city clusters and extensive sparsely settled land.
  3. Mostly rural settlement with evenly spaced small towns.
  4. Sparse city settlement with denser rural areas between.
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Question 3 of 10

A town has Indigenous place names, French street signs, and recently built Sikh temples. What do these features show?
  1. Complete replacement of older cultural influences.
  2. A single culture shown in three different ways.
  3. Several historical and present cultural influences.
  4. Cultural differences caused only by recent immigration.
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Question 4 of 10

A person moves from one Mexican state to another for a job. What type of movement is this?
  1. Internal migration
  2. Foreign immigration
  3. Remittance transfer
  4. Emigration abroad
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Question 5 of 10

Several families move to a city where relatives help them find homes and work. Which migration process best explains the shared destination?
  1. Chain migration
  2. Natural increase
  3. Climate change
  4. Falling density
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Question 6 of 10

City A has 700,000 residents within legal limits and 2.4 million in its metro area. City B has 900,000 within legal limits and 1.8 million in its metro area. Which has the larger metro population?
  1. City B, by 1.1 million
  2. City B, by 200,000
  3. City A, by 1.5 million
  4. City A, by 600,000
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Question 7 of 10

A city falls from 300,000 to 240,000 taxpayers while annual road-network costs remain 120 million dollars. How does the cost per taxpayer change, and why might lower traffic fail to solve the funding pressure?
  1. It rises 20 percent; costs track the population-loss rate.
  2. It rises 25 percent; the same network still needs funding.
  3. It falls 20 percent; fewer taxpayers share the road bill.
  4. It falls 25 percent; lighter traffic lowers the stated total.
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Question 8 of 10

Why can a smaller national capital have a stronger global political role than a much larger industrial city?
  1. Its capital status means it has the largest economy.
  2. Its political importance depends only on resident numbers.
  3. Its institutions make decisions with international effects.
  4. Its international influence comes only from factory output.
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Question 9 of 10

A neighborhood gains repaired housing and new businesses, but rents rise and many long-time tenants leave. What process and unequal effect does this show?
  1. Deindustrialization; factory closures directly lower all rents.
  2. Segregation; new investment always eliminates income gaps.
  3. Suburbanization; every original tenant gains ownership.
  4. Gentrification; investment can accompany displacement.
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Question 10 of 10

What feature distinguishes an edge city from a mainly residential suburb?
  1. A major concentration of offices and shops.
  2. A mixture of older and newer housing streets.
  3. A road connection to neighboring communities.
  4. A location beyond the old downtown boundary.
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Set 4: Follow production and trade links10 Practice Questions

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Question 1 of 10

What is the main purpose of commercial farming?
  1. Producing crops or animals for sale.
  2. Producing food mainly for the household.
  3. Growing crops only for animal feed.
  4. Raising animals only for family use.
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Question 2 of 10

A sunny farming valley receives most rain in winter, while fruit grows through a dry summer. Which investment most directly addresses its seasonal water limit?
  1. Increase summer planting without extra water.
  2. Build packing warehouses beside the farms.
  3. Store winter water for summer irrigation.
  4. Buy more harvesting machines for autumn.
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Question 3 of 10

A town depends on one mine and expands rapidly when the mineral price rises. What makes its economy especially vulnerable later?
  1. Local shop growth removes dependence on mine income.
  2. A price fall can remove its main source of jobs.
  3. A large deposit guarantees stable future employment.
  4. Past high prices protect the town from later demand changes.
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Question 4 of 10

A dam would provide low-carbon electricity and flood land used by an Indigenous community. What assessment best addresses the tradeoff?
  1. Compare power benefits and count land losses as temporary.
  2. Compare local jobs but set aside effects on river users.
  3. Compare emissions but omit who loses land and access.
  4. Compare power benefits, river changes, and land rights.
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Question 5 of 10

A factory doubles output while employing fewer workers after installing new machines. What best explains the change?
  1. Foreign competition raised local output.
  2. The factory moved all production abroad.
  3. Automation increased output per worker.
  4. Fewer workers must mean lower output.
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Question 6 of 10

A city has a university, engineering graduates, and prototype investors. Local firms cannot find specialist components quickly. It can fund either another general engineering course or a shared supplier center. Which would more directly strengthen its cluster, and why?
  1. The supplier center, because it fills the missing local link.
  2. The course, because more graduates replace every component.
  3. The course, because investors already produce specialist parts.
  4. The supplier center, because it removes the need for engineers.
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Question 7 of 10

A country exports goods worth 86 billion dollars and imports goods worth 103 billion dollars. What is its goods trade balance?
  1. A surplus of 189 billion dollars.
  2. A surplus of 17 billion dollars.
  3. A deficit of 189 billion dollars.
  4. A deficit of 17 billion dollars.
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Question 8 of 10

A plant can buy a part from Supplier A for 3 dollars plus 2 dollars shipping, with one charged border crossing. Supplier B quotes 2 dollars plus 2 dollars shipping, with two charged crossings. Each crossing adds 4 dollars. Which supply route costs less per part, and by how much?
  1. B costs 1 dollar less after border charges.
  2. A costs 3 dollars less after border charges.
  3. A costs 4 dollars less after border charges.
  4. B costs 3 dollars less after border charges.
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Question 9 of 10

A US firm moves production to its own new factory in Mexico instead of buying from a separate overseas supplier. How should this move be described?
  1. Offshoring and nearshoring, without outsourcing.
  2. Offshoring and outsourcing, without nearshoring.
  3. Outsourcing alone, with no change in country.
  4. Outsourcing and nearshoring, without offshoring.
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Question 10 of 10

Why might two countries with similar GDP per person have different HDI values?
  1. HDI measures only the total value of their exports.
  2. Their average factory size determines their entire HDI.
  3. Their health and education outcomes can differ.
  4. HDI gives higher scores to countries with larger areas.
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Set 5: Use evidence to make regional decisions10 Practice Questions

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Question 1 of 10

What climate property defines a desert?
  1. Very high temperatures
  2. No winter season at all
  3. Very low precipitation
  4. Land below sea level
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Question 2 of 10

A station at 500 m records 24°C. Using a cooling rate of 6.5°C per 1,000 m, what temperature is estimated for a nearby summit at 2,500 m?
  1. 17.5°C
  2. 11°C
  3. 7.75°C
  4. 37°C
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Question 3 of 10

A town records 1,400 births, 1,050 deaths, 600 arrivals, and 850 departures in one year. What is its total population change?
  1. A decrease of 100 people.
  2. An increase of 600 people.
  3. A decrease of 250 people.
  4. An increase of 100 people.
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Question 4 of 10

A farming district pumps 50 million m³ yearly from an aquifer receiving 30 million m³ in recharge. Plan A cuts pumping per hectare by 20 percent but expands irrigated area by 10 percent. Plan B cuts pumping per hectare by 30 percent and keeps area unchanged. Which reduces pumping more, and does either stop depletion?
  1. B reduces pumping more; neither reaches recharge balance.
  2. A reduces pumping more; neither reaches recharge balance.
  3. B reduces pumping more; both reach recharge balance.
  4. A reduces pumping more; only A reaches recharge balance.
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Question 5 of 10

A seawall reduces the probability of a damaging annual flood from 10 percent to 5 percent. The property that would be lost in such a flood then rises from 100 million to 300 million dollars. For this planning model, annual average loss is probability times the stated loss in a flood. How does the modeled average change?
  1. It falls from 10 million to 5 million dollars.
  2. It rises from 10 million to 15 million dollars.
  3. It stays at 10 million dollars despite the changes.
  4. It rises from 5 million to 10 million dollars.
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Question 6 of 10

A country’s urban population rises from 6 million of 10 million people to 8 million of 16 million. What happened to its urban share?
  1. It rose from 50 percent to 60 percent.
  2. It stayed at 60 percent throughout.
  3. It fell from 60 percent to 50 percent.
  4. It rose from 60 percent to 80 percent.
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Question 7 of 10

Two regions seek development: one has broad fertile plains, the other thin soils, exposed ancient rock, lakes, and metal ores. Which plan best matches both settings?
  1. Plains farming and Shield mining with water power.
  2. Plains farming and Shield farming on deep soils.
  3. Plains mining and Shield farming on exposed rock.
  4. Plains forestry and Shield farming on lake sediments.
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Question 8 of 10

Fifty households each receive 600 dollars monthly from relatives abroad. After layoffs, each payment falls to 450 dollars. The households spend two-thirds of these payments in local shops, with that share unchanged. How much monthly sales income do those shops lose, and what connection explains it?
  1. 7,500 dollars, through reduced remittance spending.
  2. 15,000 dollars, through reduced remittance spending.
  3. 2,500 dollars, through reduced remittance spending.
  4. 5,000 dollars, through reduced remittance spending.
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Question 9 of 10

Two vehicles meet all trade requirements except that their regional content still needs checking. Vehicle A has a net cost of 32,000 dollars and outside-region materials worth 7,000. Vehicle B has a net cost of 40,000 dollars and outside-region materials worth 11,000. Which passes the USMCA regional content test, and why is the larger regional dollar value not decisive?
  1. Only B passes; the regional dollar total determines this test.
  2. Only A passes; the regional proportion determines this test.
  3. Both pass; each has over 20,000 dollars of regional value.
  4. Neither passes; any outside-region material prevents eligibility.
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Question 10 of 10

A canal route faces drought restrictions. A firm needs 100 containers monthly. Its usual route can now carry 60; a second route can carry 30, and a third 20. If it fills the usual route and then the second route, how many containers must use the third route, and what remains dependent on conditions beyond the firm?
  1. 10 containers; delivery still depends on route capacity.
  2. 40 containers; delivery still depends on route capacity.
  3. 20 containers; delivery still depends on route capacity.
  4. 30 containers; delivery still depends on route capacity.
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Set 6: Judge changing conditions across the region10 Practice Questions

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Question 1 of 10

What feature makes Canada, the United States, and Mexico federal states?
  1. Regional governments are fully independent countries.
  2. Power is shared between national and regional governments.
  3. The national government alone controls all regional matters.
  4. The capital’s local government controls every other region.
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Question 2 of 10

A basin sends water northward to the Arctic Ocean. What does this tell you about its river’s course?
  1. The river follows falling elevation toward the north.
  2. The river must be climbing because it is flowing north.
  3. The river follows latitude, regardless of the ground slope.
  4. The river must cross the Continental Divide to flow north.
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Question 3 of 10

An airport gathers passengers from small cities onto long-distance flights. What network structure is this?
  1. Direct route
  2. Urban corridor
  3. Hub and spoke
  4. National border
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Question 4 of 10

A northern settlement experiences ground subsidence as frozen ground thaws, while roads crack and repair costs rise. Which response pair addresses both the local problem and its wider cause?
  1. Adapt road foundations and count repairs as emissions cuts.
  2. Cut emissions and leave road foundations unchanged for immediate safety.
  3. Repair road paint and treat it as adaptation to ground movement.
  4. Adapt road foundations and reduce greenhouse gas emissions.
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Question 5 of 10

Service jobs move to outer employment centers. Low-income households remain far away, and transit does not reach those centers. What would most directly improve access to these jobs?
  1. Restrict street access around the households’ current homes.
  2. Build luxury housing near downtown without transit changes.
  3. Extend affordable transit to the employment centers.
  4. Move all shops farther from both homes and employment.
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Question 6 of 10

Two towns each receive 20 million dollars in annual mining income. Town A spends 5 million on training and 5 million on new industries; Town B spends 2 million on training and none on new industries. After a price fall, mining income halves. Which town had invested more in alternatives, by how much, and why can that matter?
  1. A by 10 million dollars; other work can reduce mining dependence.
  2. A by 8 million dollars; other work can reduce mining dependence.
  3. B by 8 million dollars; retaining more cash proves greater diversification.
  4. Neither; equal original mining income means equal alternatives.
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Question 7 of 10

A factory changes from 800 workers making 160,000 units yearly to 500 workers making 150,000 units. A report says lower output proves that output per worker also fell. What happened to output per worker, and what does the job loss mean for nearby shops?
  1. It fell from 300 to 200 units; lost wages can reduce spending.
  2. It fell by 6.25 percent; every shop must gain new customers.
  3. It stayed at 200 units; lower employment leaves wages unchanged.
  4. It rose from 200 to 300 units; lost wages can reduce spending.
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Question 8 of 10

A component crosses a charged border twice. Initially its price is 20 dollars, shipping costs 4 dollars, and each crossing charge is 3 dollars. A new supplier cuts the price to 18 dollars, but each crossing charge rises to 5 dollars; shipping stays 4 dollars. What happens to delivered cost?
  1. It rises from 30 to 32 dollars despite the cheaper part.
  2. It falls from 30 to 28 dollars because the part is cheaper.
  3. It stays at 30 dollars because all changes cancel out.
  4. It rises from 27 to 29 dollars after one border charge.
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Question 9 of 10

A city receives many new workers and its population grows faster than home construction. What pressure is most likely, alongside the extra workforce?
  1. An immediate loss of all jobs.
  2. Less need for public services.
  3. More competition for housing.
  4. Falling rents across the city.
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Question 10 of 10

A report ranks two countries by GDP per person and calls every resident of the higher-ranked country better off. A second table gives the lower-income country higher health and schooling outcomes, plus large internal income gaps in both. What two revisions does the report need?
  1. Use GDP totals instead and treat internal gaps as irrelevant.
  2. Use broader development evidence and give every resident the same rank.
  3. Keep only income rankings and describe each citizen by that average.
  4. Use broader development evidence and distinguish averages from individuals.
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Stuck on your own question? Homework Help

Key Terms

122 Key Terms, each with its definition

A

Adaptation
Adaptation means changing buildings, systems, or behavior to reduce harm from climate conditions and their expected changes.
Raised streets and cooler homes can help communities cope with flooding and heat.
Agribusiness
Agribusiness is the network of commercial activities linking farm inputs, farming, processing, distribution, and sales of agricultural goods.
Seed suppliers, food processors, and supermarkets form parts of the wider farming industry.
Air mass
An air mass is a large body of air with broadly similar temperature and moisture, gained from the region where it developed.
Cold Arctic air and warm Gulf air can meet over North America's open central plains.
Annual temperature range
The annual temperature range is the difference between the warmest and coldest monthly mean temperatures in a place.
A warmest mean of 20°C and coldest of −10°C give an annual range of 30°C.
Aquifer
An aquifer is a layer of permeable rock or sediment that stores and transmits groundwater, which can be reached by wells.
High Plains farmers pump water from the Ogallala aquifer to irrigate crops.
Automation
Automation is the use of machines or software to perform tasks previously done by workers, often increasing output per worker.
A car factory can produce more vehicles after automation while employing fewer people.

B

Biome
A biome is a large ecological region with broadly similar plants and animals, shaped strongly by its temperature and moisture.
Tundra and boreal forest are different biomes found across northern North America.
Boom-and-bust cycle
A boom-and-bust cycle is a period of rapid economic growth followed by decline, often driven by changing resource prices or production.
A mine town may gain shops during high prices and lose jobs when the mine closes.
Boreal forest
The boreal forest, or taiga, is the broad northern forest of cold climates, dominated by trees such as spruce, fir, pine, and birch.
Forestry is important across the subarctic belt of Canada south of the Arctic tundra.

C

Canadian Shield
The Canadian Shield is a vast region of ancient rock around Hudson Bay, with many lakes and generally thin soils left by ice sheets.
Mining and forestry are more widespread than crop farming across much of the Shield.
Central Business District
The Central Business District, or CBD, is the concentrated urban core of offices, shops, and public buildings, often on high-value land.
Tall office buildings use scarce central land intensively in many downtown business districts.
Chain migration
Chain migration occurs when people follow earlier migrants from their family or community, helped by their information and support.
Relatives already in Los Angeles can help newcomers from Oaxaca find homes and work.
Chaparral
Chaparral is vegetation of tough, drought-resistant shrubs adapted to dry summers, especially in California's Mediterranean climate.
Long summer dryness makes chaparral landscapes vulnerable to rapidly spreading fire.
Climate
Climate is the long-term pattern of weather in a place, usually described using measurements collected over about 30 years.
Vancouver's mild winters describe its climate even when one unusually cold day occurs.
Climate mitigation
Climate mitigation means reducing the causes of climate change, especially by cutting greenhouse gas emissions or increasing carbon storage.
Replacing fossil-fuel electricity with wind power is one form of climate mitigation.
Cluster
A cluster is a concentration of related firms and institutions that benefit from nearby workers, suppliers, customers, and shared ideas.
Hollywood's film businesses draw on a common pool of studios, crews, and specialist services.
Coastal plain
A coastal plain is a low, relatively flat area beside the sea, often formed from sediment and containing marshes or deltas.
The Gulf Coastal Plain supports ports and settlements exposed to coastal flooding.
Commercial farming
Commercial farming is growing crops or raising animals mainly to sell, using land, labor, machinery, and other inputs to earn income.
A Prairie farm selling wheat to overseas buyers is engaged in commercial farming.
Continent
A continent is one of Earth's largest divisions of land, including nearby islands in the usual geographic grouping.
North America reaches from Arctic islands to the Panama–Colombia border and includes the Caribbean.
Continental climate
A continental climate is a climate strongly influenced by a large landmass, usually with a wide gap between summer and winter temperatures.
Winnipeg's inland position contributes to its large annual temperature range.
Cordillera
A cordillera is an extensive system of linked mountain ranges, often with plateaus and basins between the separate ranges.
The Western Cordillera includes both the inland Rockies and ranges closer to the Pacific.
Cultural convergence
Cultural convergence is the process in which cultures become more alike or share features through contact, trade, migration, and media.
Tex-Mex cooking combines influences from Mexico and the United States.
Cultural divergence
Cultural divergence is the maintenance or strengthening of cultural differences, including language, identity, and local traditions.
Quebec's protection of French helps maintain a distinct language landscape within Canada.
Cultural landscape
A cultural landscape is the visible imprint of people's ways of life on a place, including buildings, signs, names, and land use.
French street signs and Indigenous place names can appear in the same Canadian landscape.

D

Deindustrialization
Deindustrialization is a decline in manufacturing's role, especially its employment share, through closures, relocation, or productivity changes.
Factory job losses weakened incomes and public revenue in parts of the Rust Belt.
Disaster
A disaster is a serious disruption that causes major harm to a community and overwhelms or strains its ability to cope.
Strong shaking becomes disastrous when vulnerable buildings collapse in a crowded city.
Divide
A divide is a ridge or area of high ground separating drainage basins, so water on opposite sides flows into different systems.
The Continental Divide separates many Pacific-bound rivers from those flowing toward other oceans.
Drainage basin
A drainage basin is the area of land from which water flows into one river system, bounded by higher ground called divides.
Rain in the Ohio River basin can eventually reach the Mississippi and the Gulf of Mexico.
Drought
A drought is a prolonged period with much less precipitation than normal for a place, reducing available water for people and ecosystems.
A Plains drought can lower crop yields and reservoirs even where farming normally succeeds.

E

Edge city
An edge city is a large concentration of offices and shops outside the traditional downtown, often near major highway junctions.
Tysons near Washington developed into a major outer employment and shopping center.
Ejido
An ejido is a form of community landholding in Mexico, associated with shared land rights and farming by community members.
Some small farmers grow corn and beans on ejido land partly for household food.
Emigration
Emigration is departure from a country to live elsewhere, describing a cross-border move from the origin country's point of view.
A person who leaves Mexico to settle in Canada is an emigrant from Mexico, the country left behind.
Enhanced Fujita scale
The Enhanced Fujita scale rates tornadoes from EF0 to EF5 by damage, using the damage to estimate the winds that caused it.
Investigators inspect damaged structures before assigning an EF rating after a tornado.
Enhanced greenhouse effect
The enhanced greenhouse effect is extra warming caused by human-added greenhouse gases trapping more heat in Earth's atmosphere.
Burning coal, oil, and gas adds carbon dioxide and strengthens the greenhouse effect.
Erosion
Erosion is the removal and transport of rock or soil by moving water, ice, wind, or gravity, which gradually reshapes the land.
Long erosion has helped lower the old Appalachian Mountains compared with the younger Rockies.
Export
An export is a good or service sold to another country, described from the seller's country rather than the buyer's.
Seats made in Mexico and sold to a US assembly plant are an export from Mexico.
Exposure
Exposure is the presence of people, buildings, or other assets in a location where a hazard could affect them.
Building more homes on a low coast increases exposure even when a seawall offers protection.

F

Federal state
A federal state is a country in which governmental powers are divided between the national level and regional units such as states or provinces.
Canada's provinces have powers alongside the federal government, as part of one country.
Fire triangle
The fire triangle is the combination of fuel, oxygen, and heat needed for a fire to start and continue burning.
Dry vegetation supplies fuel, while lightning can provide the heat that ignites a wildfire.
Front
A front is a boundary between contrasting air masses, where changes in temperature and moisture can produce clouds and storms.
Storms may develop as a cold front pushes east across the Great Plains.

G

Gated community
A gated community is a housing area with controlled entry, often using walls or barriers and private services that separate it from surrounding streets.
Gated developments in Sun Belt cities can make separation by income visible in the landscape.
Gentrification
Gentrification is neighborhood change involving new investment and wealthier residents, often accompanied by rising housing costs.
A repaired apartment building may attract higher rents that long-time tenants cannot afford.
Ghetto
A ghetto is an area where a group is concentrated under constraints such as poverty or discrimination, with limited freedom to live elsewhere.
An ethnic neighborhood built around shared services and choice is not necessarily a ghetto.
Globalization
Globalization is the growth of connections among places through trade, investment, migration, media, technology, and other flows.
A phone sold in North America may link Asian parts, Mexican assembly, and US design.

H

Heat wave
A heat wave is a period of unusually hot weather for a place and season, which can threaten health and strain water and power supplies.
The 2021 western heat wave brought dangerous temperatures to communities in British Columbia.
Hinterland
A hinterland is the surrounding or inland area served by a city or port, linked to it through transport, trade, and other services.
Railroads connect an ocean port with customers and producers across its inland hinterland.
Hub-and-spoke network
A hub-and-spoke network collects passengers or freight at a central transfer point and redistributes them along routes to other places.
A traveler from a small city may transfer at Chicago to reach a long-distance flight.
Human Development Index
The Human Development Index, or HDI, combines measures of health, education, and income to compare broad development outcomes.
A country can rank higher on HDI than its income alone suggests because health and schooling matter too.
Hurricane
A hurricane is a tropical cyclone with sustained winds of at least 74 mph, powered by heat and moisture from warm ocean water.
A hurricane can threaten Mexico's coast with wind, heavy rain, and storm surge.
Hydroelectric power
Hydroelectric power is electricity made by using moving water to turn turbines, often with water stored behind a dam.
The Columbia River system produces electricity as water flows through its power stations.

I

Immigration
Immigration is entry into a country to live there, describing a cross-border move from the receiving country's point of view.
A person arriving from Mexico to settle in Canada is an immigrant to Canada.
Import
An import is a good or service bought from another country, described from the buyer's country rather than the seller's.
A US factory buying seats from Mexico records them as an import into the United States.
Indigenous peoples
Indigenous peoples are peoples with historical ties to lands before colonization, maintaining distinct identities, communities, and rights today.
First Nations, Inuit, and Métis are distinct groups of Indigenous peoples recognized in Canada.
Informal economy
The informal economy consists of work outside full formal regulation or protection, often providing income with insecure conditions.
Some street sellers and day laborers depend on work without stable employment protection.
Irrigation
Irrigation is the artificial supply of water to fields, often through canals, pipes, or pumps, when rainfall does not meet crop needs.
Central Valley farms use stored and transported water during California's dry summers.

L

Lake-effect snow
Lake-effect snow forms when cold air crosses warmer lake water, gains moisture, and carries snowfall toward the downwind shore.
Westerly winds can deliver heavy snow east of the Great Lakes, including near Buffalo.
Latitude
Latitude measures how far north or south a place lies from the equator, in degrees, and helps explain differences in solar heating.
The Arctic Circle crosses northern Canada, while the Tropic of Cancer crosses Mexico.
Leeward side
The leeward side is the sheltered side of a mountain away from incoming wind, where descending air often becomes warmer and drier.
Yakima lies east of the Cascades, on the leeward side of the main moist Pacific airflow.
Location factors
Location factors are the conditions influencing where an activity develops, including resources, workers, transport, markets, costs, and government rules.
A software firm values skilled workers differently from a steel mill moving heavy materials.
Lock
A lock is an enclosed section of a waterway in which water levels rise or fall to move ships between stretches at different heights.
Locks allow ships to bypass the height barrier at Niagara Falls through the Welland Canal.

M

Magnitude
Magnitude measures an earthquake's size from seismic waves; an increase of one whole step corresponds to about 32 times the energy.
Two earthquakes with similar magnitudes can cause very different losses in different cities.
Maquiladora
A maquiladora is a factory in Mexico that assembles or processes imported components for export, often linked closely to US markets.
Border cities such as Tijuana have factories combining imported parts with local assembly work.
Maritime climate
A maritime climate is a climate strongly moderated by the sea, usually with a smaller seasonal temperature range than inland places.
Pacific water and winds help keep Vancouver's winters milder than Winnipeg's.
Mediterranean climate
A Mediterranean climate has warm to hot, dry summers and mild, wetter winters, creating a seasonal shortage of water for crops.
California's fruit and nut farms often need irrigation during the dry summer growing season.
Megacity
A megacity is an urban area with more than 10 million residents, a measure of population size rather than global political importance.
Mexico City qualifies as a megacity because of the population in its wider urban area.
Megalopolis
A megalopolis is a large connected urban region formed from several metropolitan areas linked by settlement and transport.
The Boston–Washington corridor links several major metro areas along the Atlantic side.
Metropolitan area
A metropolitan area is a city and its surrounding communities linked closely by commuting, employment, and daily economic activity.
New York's metro population is much larger than the population within its city limits.
Migration
Migration is the movement of people to live in a new place, either within one country or across an international border.
A move from a Mexican village to Mexico City is migration within the same country.

N

Natural change
Natural change is births minus deaths in a population over a period; it is positive when births exceed deaths and negative when they do not.
A town can have natural increase even while more people move out than move in.
Natural hazard
A natural hazard is a natural event or process that could harm people, property, or services, even if serious damage does not occur.
An earthquake far from settlements may release great energy while harming few people.
Natural resource
A natural resource is something from nature that people use, such as water, timber, fish, oil, or metal ores, when access and technology allow.
A mineral deposit needs transport and workable extraction before it can support a profitable mine.
Nearshoring
Nearshoring is moving work to a nearby country, often to shorten supply routes and stay closer to the main market.
A factory serving US buyers may move from Asia to Mexico to reduce distance to customers.
Net migration
Net migration is the number of arrivals minus departures for a place over a stated period, giving a gain or loss through movement.
A district with 900 arrivals and 1,100 departures has net migration of −200.
Nonrenewable resource
A nonrenewable resource forms so slowly that using it reduces a supply that cannot be replaced on human timescales.
Extracting oil from Alberta uses deposits that took millions of years to form.

O

Offshoring
Offshoring is moving work from one country to another, whether it is done by the same company or a separate supplier.
A company opening its own overseas factory offshores work without hiring another producer.
Oil sands
Oil sands are deposits of sand mixed with heavy oil, water, and clay, requiring processing to separate usable petroleum.
Alberta's oil sands support extraction jobs and pipeline trade while creating land and waste impacts.
Outsourcing
Outsourcing is paying another firm to do work, whether the supplier is located in the same country or in another one.
A Canadian business can outsource deliveries to another Canadian company without offshoring.

P

Permafrost
Permafrost is ground that remains at or below freezing for at least two years, beneath a surface that may thaw in summer.
Thawing permafrost can weaken the ground supporting northern roads and buildings.
Plateau
A plateau is a broad area of relatively level land that stands above the surrounding lowlands, sometimes bordered by steep slopes.
Mexico City's high plateau location helps explain its mild climate within tropical latitudes.
Population density
Population density is the average number of people per unit of area, calculated by dividing a population by the area it occupies.
A national density of four people per km² can hide cities with thousands per km².
Population distribution
Population distribution is the pattern of where people live across an area, including dense concentrations and sparsely settled regions.
Canada's settlement map shows a southern concentration and large areas with few people.
Preparedness
Preparedness is planning and practice before a hazard occurs, including warnings, evacuation arrangements, supplies, and emergency drills.
A school practices its tornado shelter plan before severe weather threatens the area.
Primary sector
The primary sector includes work that takes resources directly from nature, such as farming, fishing, forestry, and mining.
Mining potash in Saskatchewan belongs to the primary sector of the economy.
Pull factor
A pull factor is a feature attracting people to a destination, such as jobs, safety, education, or relatives who can offer help.
Industrial jobs pulled many Great Migration households toward northern and western cities.
Push factor
A push factor is a condition in an origin place that encourages people to leave, such as unsafe conditions, job shortages, or drought.
Racism and limited opportunities helped push Black Americans out of the South during the Great Migration.

Q

Quaternary sector
The quaternary sector involves knowledge-based work such as research, information services, and technological development.
A robotics research team in Pittsburgh carries out knowledge-based economic activity.

R

Rain shadow
A rain shadow is a dry area on a mountain's leeward side, formed after rising air has lost moisture on the windward slope.
The Sierra Nevada helps create dry conditions farther east, including around Death Valley.
Recovery
Recovery is the process of restoring homes, livelihoods, services, and infrastructure after a disaster, sometimes with stronger protection.
Rebuilding a damaged school to stronger standards improves recovery and future safety.
Redlining
Redlining is discriminatory classification or treatment of neighborhoods in lending, historically restricting credit in many Black communities.
Restricted mortgage access reduced opportunities to buy homes and build family wealth.
Region
A region is an area grouped by shared features, with boundaries chosen to suit a purpose such as studying climate, culture, or trade.
Mexico belongs to North America by continent and to Latin America through language and history.
Relief
Relief is the difference in height and shape of land across an area, including mountains, valleys, plateaus, and plains.
The steep relief of the western mountains makes road building harder than on broad plains.
Remittances
Remittances are money migrants send to relatives or other people in their place of origin, often supporting household needs.
Income earned abroad can pay for schooling, housing, and food in a Mexican village.
Renewable resource
A renewable resource can be replenished through natural processes, provided use does not exceed its ability to recover over time.
A fish stock can renew, but heavy catches can still cause it to collapse.
Response
Response is the urgent action taken during and immediately after a disaster to save lives and meet essential needs.
Rescue crews and emergency medical teams take part in the response after an earthquake.
Risk perception
Risk perception is how dangerous people believe a hazard or location to be, which can differ from measured probability or likely harm.
A long period without flooding may make residents underestimate the danger of a riverfront home.
Rules of origin
Rules of origin determine where a product counts as being made and whether it qualifies for a trade agreement's regional treatment.
A vehicle must meet regional content and other requirements to qualify under USMCA rules.
Rust Belt
The Rust Belt is the former manufacturing heartland around the Great Lakes and Northeast, where industrial job losses reshaped many communities.
Detroit and Cleveland show how factory change can affect housing, tax income, and local services.

S

Saffir-Simpson scale
The Saffir-Simpson scale rates hurricanes from Category 1 to 5 using sustained wind speed, leaving out rain and storm-surge height.
Harvey's severe rain flooding shows why the wind category alone cannot describe total danger.
Secondary sector
The secondary sector makes or processes goods from materials and components, including manufacturing and industrial production.
A car assembly plant turns parts into finished vehicles in the secondary sector.
Segregation
Segregation is the separation of groups into different areas, shaped by income, discrimination, housing rules, and personal choices.
Past barriers to loans and home purchases helped create lasting housing separation in US cities.
Social polarization
Social polarization is a widening gap between richer and poorer groups, often visible in jobs, incomes, housing, and access to services.
High-paid financial work can grow alongside low-paid cleaning work in the same world city.
Steppe
A steppe is a semiarid grassland with limited precipitation, too dry for most trees but wetter than the driest desert areas.
Wheat and cattle are important uses of the drier western Great Plains.
Storm surge
A storm surge is an abnormal rise in coastal seawater pushed ashore by a storm, which can flood low-lying land beyond normal tides.
A lower hurricane wind category does not remove storm-surge danger on a low coast.
Subduction
Subduction is the process in which one tectonic plate sinks beneath another, creating conditions for strong earthquakes and volcanism.
The Juan de Fuca Plate sinks beneath North America in the Cascadia subduction zone.
Sun Belt
The Sun Belt is the southern and southwestern US region that attracted people and firms through jobs, warm winters, land, and business conditions.
Growth in Phoenix and Houston increased demand for housing, roads, and water supplies.
Supply chain
A supply chain is the connected sequence of materials, production, transport, and selling that brings a product to its buyer.
Wiring, engines, and seats made in different countries can enter one North American car.

T

Tariff
A tariff is a tax charged on imported goods, which can raise their price and affect producers, customers, and supply-chain costs.
A new charge on imported steel can increase costs for a factory that uses that steel.
Territory
A territory is an area under a country's authority that has a different political status from an independent country.
Puerto Rico is a US territory, while Greenland is a self-governing part of the Kingdom of Denmark.
Tertiary sector
The tertiary sector provides services to people and businesses, including transport, retail, health care, tourism, and finance.
Hotels in Cancún and banks in Toronto both supply services in the tertiary sector.
Tornado
A tornado is a violently rotating column of air extending from a thunderstorm cloud to the ground, usually over a narrow area.
A tornado can damage a narrow path while nearby neighborhoods escape its strongest winds.
Trade balance
The trade balance is the value of exports minus imports over a period, giving a surplus when positive and a deficit when negative.
Exports of 40 billion dollars and imports of 55 billion produce a 15 billion dollar deficit.
Transform boundary
A transform boundary is a plate boundary where two plates slide sideways past each other, creating strain and possible earthquakes.
The San Andreas Fault marks sideways movement between the Pacific and North American plates.
Tributary
A tributary is a river or stream that joins a larger river, adding water from part of the larger system's drainage basin.
The Missouri and Ohio are major tributaries that carry water into the Mississippi.
Tsunami
A tsunami is a series of waves caused by sudden displacement of water, commonly when a large earthquake moves the sea floor.
The 1964 Alaska earthquake sent tsunami waves to distant coasts, including California.
Tundra
Tundra is a treeless biome with low plants and a short, cold growing season, found across Arctic lands and on high mountains.
Mosses and low shrubs grow near Iqaluit, where summers are too cool for forests.

U

Urban sprawl
Urban sprawl is the spread of low-density housing, shopping, and other development into surrounding land, often increasing car dependence.
A spread-out suburb needs long road and pipe networks to serve relatively few homes.
Urbanization
Urbanization is an increase in the share of a population living in towns and cities, which can differ from growth in urban numbers alone.
If rural population grows faster than urban population, the urban share can fall as cities grow.
USMCA
The USMCA is the trade agreement between the United States, Mexico, and Canada that replaced NAFTA in 2020, setting regional trade rules.
The agreement is called CUSMA in Canada and T-MEC in Mexico.

V

Vulnerability
Vulnerability is how easily people or systems can be harmed by a hazard and how limited their ability to cope and recover may be.
Weak housing and lack of evacuation transport can raise a community's vulnerability.

W

Weather
Weather is the condition of the atmosphere at a place and time, including temperature, precipitation, wind, and cloud cover.
A cold front can change the weather in Kansas within hours, bringing storms and cooler air.
Windward side
The windward side is the side of a mountain facing incoming wind, where rising moist air often cools and releases precipitation.
Pacific winds bring heavy precipitation to west-facing slopes of the Cascades.
World city
A world city is a major hub in international networks of finance, politics, culture, information, or trade, with influence beyond its size.
Washington's international political role is greater than its population alone would suggest.

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