Every country that tries to break from the petro dollar immediately becomes the enemy of the US....then they get a healthy dose of "democracy freedom".
ftfy
It's true though. Iraq wanted to trade in euro so Saddam was declared a start-a-war-class criminal. 'dafi wanted to have a gold based money so he was offed (literally, shot in the head in the middle of the street).
Oil and military threats are the only things backing up the dollar, and thus the states, at this point.