Aliens land? Monsters emerge out of the ocean? :P

There'd be a big war and after that who knows what the world would look like. The fact you still see the world as necessarily dipole, a tension between great powers vying for control over "the little people" kind of makes my point.

There is no difference between an American and a Chinese hegemony. The problem isn't that the hegemony we have is American. The problem is hegemony.