Suburbia requires land and desert land is very cheap when market-priced, so long as the true costs of drinking and lawn grass watering for the land are externalized. Unfortunately, that leaves the region exposed to the Colorado watershed collapse and associated “which metropolis gets the axe” politics:

America’s desert metropolis Is on the short list to lose water (6 hours ago) https://www.nytimes.com/2026/08/23/us/arizona-canals-colorad...

(I suspect the interstate highway system also contributed to migrations, but haven’t done the research.)