Adding because this has somehow been forgotten around Iraq/911. We attacked Iraq because we were attacked on 9/11. Justification for the attack was stated in part because of American troops in Saudi Arabia. American troops were in Saudi Arabia because of Iraq's prior invasion of Kuwait. Changing the government of Iraq would allow us to remove troops from Saudi Arabia and remove it as a cause for terrorism. This was a discussed cause for going into Iraq at the time, just not the main one everyone publically glommed onto. But there was a reason the US wanted to take out Iraq. Iraq was tied to 9/11 by being an indirect motivator of 9/11.