What areas of the US did you have in mind, specifically? I must point out that much of the available space is marginally suitable, at best, for residential com

What areas of the US did you have in mind, specifically? I must point out that much of the available space is marginally suitable, at best, for residential communities. We already have large cities in places that require unsustainable levels of resource consumption to continue existing. Just considering water: Los Angeles is a desert made green by importing water from hundreds of miles away (and destroying the communities that used to exist near the water sources). The Colorado River is oversubscribed, and most years never reaches the ocean. Groundwater sources like the Ogallala Aquifer are depleted. This doesn't begin to count the effects of sprawl and urbanization on wildlife populations.