Because America is the best place in the world to be, and the whole WORLD knows it.
Other countries hate us because our power and cultural affluence around the world cannot be matched.
Because America is one of the few countries you can live in, take advantage of and hate, and not get thrown in jail or worse.
If you don't want to register for things, go to www.bugmenot.com and they will give you instructions on how to log in with a previously-prepared and non-traceable name and password. It works for everything but the LA Times.
The french are also ticketed off because french is not the universal language it once was.