So given Marc and WILF's points, I would say that the "English Civil War" belongs in that HUGE pile of historic misnomers.

More accurately, it was a revolutionary insurgency.
(I classify insurgencies into three broad categories: Separatist, Revolutionary, and Resistence)

I Iraq we had all three types of insurgency going on at once; in Afghanistan we have at least two; and anyplace that the US goes there will be causation (though it may not manifest into actual conflict) for a resistence insurgency. How we act can temper the effects of that causation, but only our departure can remove the causation.