well, we beat russia before and they are still pretty messed up economy wise. chine definitely has the size to take on about whoever they want, but Idt have the smarts to take us on. North korea wed just bomb the heck out of because were sick of their bull, same with middle east. and south america? well probably half the countries would be on our side, so theyd self destruct. plus we have the canadians.
if it really came to the US going down, Im pretty sure wed threaten nukes because we have like a large portion of the worlds, or something better we just havent told anyone about. then it would go cold because hopefully no one is dumb enough to escalate at that point.