[@The Spectre] So far the only established culture is the one I mentioned (And according to what Gowi told me about his country's history/culture the northeast might be Not-China/Mongolia) so the rest of the world's cultures are up to the players.

EDIT: If you'd define "The Americas" as the underdeveloped land of dudes killing elks with spears, then that's a no. The nomads, cave-dwellers and generally tribal peoples that would get steamrolled by an actual army live in all the places people haven't claimed by the start of the IC.