I'm not going to get into arguing definitions, but I would throw out one or two examples of what is going on in Iraq now from American history...
One would be the "Bleeding Kansas" of the 1850's. For non-Americans (or americans who slept though this section of History class in High School), the territory of Kansas was left open to decide by popular vote if it would be a slave or a free state. Both "Free-Staters" and Slaveowners moved to Kansas, and folks from North and South sent money--and guns--to help thier side. It was the place that Osowatamie (sic) John Brown first came to the nations attention when he slaughtered five (IIRC) Pro-Slavery people. Not a lot of death, in the end, but plenty of burned buildings, political chicanery, and a hardening of feelings. It wasn't a "Civil War" per se, but it was another brick that helped to build up to one.
Perhaps an even better one would be the plight of Missouri during the American Civil War 1861-1865. The state was divided between North and South (indeed, the Legislature and Governor tried to take the state out of the Union and were driven into exile by Federal troops-if you see the Confederate Battle Flag, it has 13 stars, although only 11 states actually were considered the Confederacy--Missouri and Maryland were also "part" of the Confederate States, according to the South).
The fighting in Missouri, especially after 1862, was not one of major battles but of small skimishes, raids, and attacks on neighbors/residences that led to small, brutal little fights all over the state. It even had the Law (as represented by Northern troops) and Government (a newly elected legislature and governor) and outside agitators (Southern raiders from Arkansas and Kansas). It is hard to know exactly how many were killed in this conflict, but it was a smaller, and in some ways, nastier Civil conflict in the midst of a much larger one.
Is there a Civil War in Iraq? I think the point is has the killing, which may have begin with the insurgents, now self-sustaining between Sunni and Shia? Something that will take place even if we and the 'outside' influences were withdrawn tomorrow?
I think it will. I am not happy with that conclusion, but I think it will.
History is one tough Bastich to figure out--especially in reading the future. We'll all be around to see what comes next, I think--unless hgc doesn't cool down and get himself banned...
IMHO as always