Until you want to build a train line (or some other form of public transportation).
Wait a second, I think I just described Portland.
People see a block of land that's "unused" so they simply move there and start "developing" it. Sometimes they'll legally own the land ("adverse possession") but usually it doesn't matter. It's theirs because they're there and they're willing to defend themselves and "their" land even if they don't have a deed.
So sure, go ahead and buy a bunch of land, in the USA or elsewhere; you'll need to be prepared to enforce your ownership stake or lose it.
Locals just assume the property while the owners are away and force them into a court unfriendly to foreigners.
I read about a person who had to go to the US for cancer treatment and in the interim his otherwise full-time primary residence was stolen.
And there’s a bunch of land for sale outside of the UK which can be bought and let to go back to prairie or whatever. You can get 10,000+ acre ranches for a few million in places like Nebraska and just let some buffalo lounge around.
https://www.gov.scot/policies/land-reform/community-right-to...