I'd honestly prefer sticking to america due to the fact that it has the most fleshed out lore. That being said, I'm digging the southern idea, I know of this other rp on a different site that took place in coastal Virginia and the new hazards and elements like constant rainstorms and flooding and civilization adapting to radioactive water and stuff was really interesting. Maybe we can do like a nomadic boat community that moves along the southern and maybe even western coast?