All great country had a begining, a golden age, hard time and finaly a damn end...
After the greeks, the romans, the french and the english... the us..
In your idea, when was the golden age of the us, empire-like speaking... WWII? after? cold war?
And are the us on the downside of their domination as an empire? still going up?
What will break the "empire"? how will be the us after?
(Doing an homework, will write up your name as a "personnal source" if any wants )