Fly over the US and observe that the place is mostly empty. Land is not the problem. Lack of economic opportunity and initiative are the problems.

It's almost entirely "used." The places that look "empty" are pasture, fields, private timberland and national parks, and the few remaining pockets of actual nature should probably be left the hell alone.

There are ten thousand small towns (like, say, Bird Island) whose population has been declining for decades, due to lack of economic opportunity. You don’t have to choose between a city and an isolated home.