Most of it is civilized by now, I'm fairly sure - we tend to create cities and settlements, as opposed to flat-out living in caves; if we can't, it's considered impractical to live there, though I'm sure some do.

I'm honestly not terribly familiar with the cultures in other countries, unfortunately - at least, not as much as I'd like to be. I've only left Amestris' borders once in my life, and that was for a very brief period of time.