The questions of what “caused” the American Civil War and whether the conflict was avoidable or inevitable has spawned countless books and articles, running the gamut from balderdash to convincing, but none of which I would say settle those questions fully and finally. Prolific author Thomas Fleming takes a crack at it in A Disease in the Public Mind: A New Understanding of Why We Fought the Civil War, from Da Capo Press. Reviews have been mixed at best, and pretty gnarly at worst. In a nutshell, Fleming argues that the conflict was the outcome of deep-seated sectionalism that predated the founding of the nation. Extremist, abolitionist thinking in the north perhaps even caused a pervasive fear of slave revolt in the south. No bibliography is provided, and notes are heavy with secondary sources.