Is civil war in Iraq a possiblity?

Let's see, the occupying force of a military superpower leaves a country that has been held together by military power for decades.

To me, this sounds a lot like Yugoslavia and Afganistan.

I wonder what will happen...

I'd say it's a racing certainty. Let's not forget that Iraq's "borders" are less than 100 years old.

BTW, would it be rude to point out that there's more than a US presence in Iraq?