Umm...
Any fantasy resource would probably do. D&D allows you to create whole worlds out of nothing more than your imagination... although you need to do all the grunt work yourself.
If it's only the social side that's changed, you might just need to mention some historical event that took place differently {i.e. Hitler won, or the cold war turned nuclear} and then explain the consequences {i.e. How your world is different}.
I somehow doubt there's a full, fill-in-the-blanks create-a-world resource. Your probably gonna have to decide what's different and jot it down yourself.
|