I've long had a theory that if the cities continue down the road that they're on and eventually become Mad Max lands, some of the places that people assume will be "safe" from mass migration from the cities won't be safe. Places like Montana, Wyoming, New Mexico, Utah, and even Alaska will be magnets for their natural splendor and the continued sense that they are wide open or empty. I believe the safest place from this kind of mass migration will be the rural Dakotas, and particularly North Dakota. So, if our political and cultural divisions eventually result in absolute incompatibility or even civil war, which I really do think is possible, you may want to check out properties in central ND. It'll be safe for a long time. But, of course, South Dakota has no state income tax, so you may want to investigate there, too.