We didn't invade Iraq?!?
The whole thing is spiraling towards civil war. Shiites are killing Sunnis and Sunnis are killing Shiites. And the Kurds are preparing to break off and become an independent state.
This is a civil war we set in motion by invading and destabilizing their country. And, it was entirely predictable given the history of enmity among these very distinct cultures - distinctions which are lost on the simpletons who took us to war in the first place.