Wanderlust World Wanderlust World The Mexican Cession (1848 Treaty of Guadalupe Hidalgo) transferred 529,000 sq mi to the U.S.—today's California, Nevada, Utah, Arizona, New Mexico, Colorado, Wyoming. Its geography is a tectonic collage of extremes.
Eastern edge: Sangre de Cristo, San Juan, Front Ranges. Peaks >14,000 ft (Elbert 14,440 ft, Blanca 14,351 ft). Glacial cirques, alpine tundra, headwaters of Rio Grande, Arkansas, Platte.
Centered on Four Corners. Layered sedimentary strata carved into Grand Canyon, Monument Valley, Canyonlands, Arches. Elevation 5,000–11,000 ft. High desert with pinyon-juniper woodlands.
Western Nevada/Utah: parallel fault-block mountains (Toiyabe, Snake, Wasatch) separated by endorheic basins. Death Valley (-282 ft, hottest/driest NA). Playas, salt flats, bristlecone pines.
Rain-shadow desert (Sierra Nevada blocks Pacific moisture). Joshua trees (indicator species). 2,000–5,000 ft. Extreme summer heat (120°F+), winter freezes.
Southern AZ/CA/Mexico. Biotic richness: saguaro, organ pipe cactus, palo verde. Two rainy seasons (winter frontal, summer monsoon). Lower, hotter than Mojave.
| Region | Köppen | Key Features |
|---|---|---|
| Rockies/Plateau highlands | Dfb/Dfc (humid continental/subarctic) | Cold snowy winters, mild summers, orographic precip |
| Plateau mid-elevations | BSk (cold semi-arid) | 10–15" precip, high evaporation |
| Great Basin | BWk (cold desert) | Extreme diurnal swings, <10" precip |
| Mojave | BWh (hot desert) | Summer >100°F, <5" rain, winter frost |
| Sonoran | BWh (hot desert) | Bimodal rain, mild winters, highest NA desert biodiversity |
| Central Valley CA (far west edge) | Csa (Mediterranean) | Wet winters, dry hot summers, ag heartland |
Unifying theme: aridity gradients driven by rain shadows (Sierra, Cascades, Rockies) and latitude. Water—Colorado River, Rio Grande, groundwater—defines settlement.