Can US Prevent Civil War in Iraq?

""If the Iraqi government can't stop sectarian killing today when it is able to call on the world's most powerful military, it can hardly be expected to do so once the Americans have left. The more likely outcome is an escalation of the civil war, with elements of the security forces taking sides. The Shi'ite militias will enjoy numerical superiority and the continued surreptitious backing of Shi'ite Iran. But what the Sunni insurgents lack in numbers, they make up for in greater killing experience."
Iraqi Mojo