Behind the Invasion:

"Pentagon whistleblower and former USAF lieutenant colonel Karen Kwiatkowski said the US invaded for three reasons of pure self-interest. Unless America took Iraq by force, sanctions would soon be lifted against Saddam Hussein and European companies, not US firms, would get lucrative contracts. The US wanted to reverse Saddam's decision to trade his oil in euros not the $US (one of Bush's first decisions after Saddam's statue fell). And Bush wanted to move US Middle East military bases from Saudi Arabia to Iraq."