The problem with the current US is that it believes it must wage war against terrorists.
This means it's not a war against a nation (though Bush tried very hard but he was powerless about it, to pretend countries are actually financing terrorism-without being able to proove it like WMDs in Iraq) and its forever because there are no representatives of a nation, no peace treaty possible and no possibility to completely stop terrorism as it always uses surprise to achieve its means.

I am not aware of any nation that invaded the US since the end of the Cold War, therefore it has no enemy. And yet, it keeps repeating it has enemies....Who? How can they be a threat to the US? They know very well they can't fight the US, so they don't (if they existed).
Sorry, but invading Iraq while that nation never was a threat to even its neighbours and never could have done what Bush said , brought a very disturbing image of what the US has turned into.
What goes on in Iraq now didn't happen under its former dictator
and is the consequence of the invasion.