Not true, democratic peoples favor local representation. The cycle of government throughout history proves that once the government becomes too centralized, it will break apart again. You think anybody would vote for a global body of governance? (Besides you, of course ) I think nationalism to the extent that it does today wouldn't exist in a true free market though.
Yes, but It's a pretty good basis for presumption. And America's already got all the symptoms of a falling empire.
Including a Universal Declaration of Human Rights that the whole world respects, at least superficially. But hey, what does that have to do with it? Honestly I don't know... I'm high right now.