We think we know civil war when we see it. Yet ideas of what it is, and isn't, have a long and contested history. Defining the term is acutely political, for ideas about what makes a war "civil" often depend on whether one is ruler or rebel, victor or vanquished, sufferer or outsider; it can also shape a conflict's outcome, determining whether external powers are involved or stand aside. From the American Revolution to the Iraq war, pivotal decisions have hung on such shifts ...
