Four Great Regions of North America: A Geographic Framework

North America is commonly divided into four major physiographic/cultural regions. This classic framework (used in geography textbooks and regional planning) organizes the continent by shared landforms, climate, and human patterns:

1. The North (Canadian Shield & Arctic)

• Extent: Canada (Shield, Arctic Archipelago), Alaska (Brooks Range, North Slope), Greenland
• Landforms: Ancient Precambrian Shield, Hudson Bay lowlands, Arctic tundra, boreal forest (taiga)
• Climate: Subarctic to polar; permafrost widespread
• Resources: Minerals (diamonds, gold, nickel), hydroelectric, timber, wildlife
• Population: Sparse (<1M); Indigenous (Inuit, Dene, Cree) majority in north

2. The West (Cordillera & Pacific)

• Extent: Western US (Rockies to Pacific), Western Canada (BC, Yukon), Western Mexico (Sierra Madre)
• Landforms: Rocky Mountains, Sierra Nevada, Cascades, Coast Ranges, Basin & Range, Colorado Plateau
• Climate: Extreme diversity — rainforest (Olympic), desert (Mojave, Sonoran), alpine, Mediterranean (CA coast)
• Resources: Gold, copper, timber, water, solar/wind, recreation
• Population: Concentrated in valleys/coasts (LA, SF, Seattle, Vancouver, Phoenix, Denver)

3. The Midwest (Interior Plains & Great Lakes)

• Extent: Central US (Ohio to Rockies), Central Canada (Prairies, Ontario shield margin)
• Landforms: Glaciated plains, Great Lakes, Mississippi/Missouri/Ohio basins, Badlands
• Climate: Humid continental — hot summers, cold winters; tornado alley
• Economy: Corn Belt, Wheat Belt, manufacturing (Rust Belt), energy (oil, wind)
• Population: 60M+ US; major cities: Chicago, Detroit, Minneapolis, Toronto, Winnipeg

4. The South (Gulf-Atlantic Coastal Plain & Highlands)

• Extent: Southeast US (Atlantic to Texas), Northern Mexico (Tamaulipas, Nuevo León)
• Landforms: Coastal Plain, Piedmont, Appalachians (south), Ozarks, Ouachitas, Mississippi Delta
• Climate: Humid subtropical — long growing season, hurricanes, mild winters
• Culture: Deep South, Appalachia, Texas, Florida, Borderlands — distinct subregions
• Economy: Energy (TX/LA), automotive (AL/GA/SC), aerospace, tourism, agriculture

Why This Framework Works

These regions reflect first-order geography: the Shield, the Cordillera, the Interior Plains, the Coastal Plain. Political boundaries (US/Canada/Mexico) cut across them, but the physical and ecological logic holds.