The USA, imo, is entering a similar phase as the old Soviet Union under Brezhnev: a period of thrashing around on the international scene, throwing it's military weight around (remember the Brezhnev Doctrine - in which the USSR insisted it had a "right" to wade into other people's countries if it's interests were at stake?) while it's economy gets more and more messed up and the general population suffers economically as a result. It is also ruled by a leader who doesn't seem to have a clue and is a useful tool for hawkish elements in the upper echelons of the political establishment.
Going at this rate, the USA politcal scene will produce an American Gorbachev who''ll try reform things a bit in order to prevent it falling apart. They've already had their equivalent of Chernobyl, imo, in the form of the New Orleans hurricane disaster - in which the US politcal establishment proved itself incapable of looking after it's own people and also delayed foreign assistance initially.