Like you said, just because battles are occuring in a state does not mean they are occuring all over the state. Yes, violence in occurring in those 4 sectors, however, it is contained within a 45 mile radius from Baghdad proper.Do you know what the definition of proportion is? Look at geography here. The four provinces you named with the violence occurring in them make up a third of the nation's land size. If you want to toss in that Kurdish north it grows more. Sectarian violence occurs all over Iraq. You have stated that a majority of it occurs in or near Baghdad and the Kurdish regions. Flipping to the Civil War, battles occurred in several states but a majority of them occurred in TN and VA and not all over those states either.
The violence that was occuring, en masse, during the Civil War occured across the whole TN, across all of northern and eastern Virginia, eastern Carolina, north Georgia, north Alabama, western Mississippi, and New Orleans. Again, if those are the restrictions you want to make, go for it.