The United States does not have a real capitalistic system, because big government bails out bad companies with tax payer money, borrows heavily from foreign bankers (federal reserve) to fund it's fiscally irresponsible overspending. The American consumer bubble economy won't last for much longer.
America does not produce much themselves anymore, that the rest of the world would want to buy other than Hollywood movies, games and music. This causes big trade deficits.
The American government rewards bad businesses while punishing the little guys, and creates bad economic conditions where American companies can barely compete with the rest of the world.