James Oliver Horton and Lois E Horton. Slavery and Public History: The Tough Stuff of American Memory. Chapel Hill: University of North Carolina Press, 2009.
via UNC Press:
In April, when Virginia Gov. Bob McDonnell issued a proclamation reviving Confederate History Month in the commonwealth, he reminded us once again of the Confederacy’s staying power. Wittingly or not, McDonnell demonstrated that historical “memory disputes” are always about the present, as he spoke in the tradition of a long line of Southern leaders beginning with the founders of the Confederacy itself.
Immediately, Civil War causation and slavery became the lightning-rod issues as McDonnell’s defense of his proclamation flashed all over American media.
“There were any number of aspects to that conflict between the states,” he said. “Obviously, it involved slavery. It involved other issues. But I focused on the ones I thought were most significant for Virginia.”
It involved slavery. In that throw-away phrase, the governor spoke volumes, even if he didn’t know it. To put it simply, yes, slavery was the cause of the Civil War.