When Charles Adams published his book For Good and Evil, a world history of taxation, the most controversial chapter by far was the one on whether or not tariffs caused the American War between the States. That chapter generated so much discussion and debate that Adams's publisher urged him to turn it into an entire book, in the form of When in the Course of Human Events: Arguing the Case for Southern Secession. Many of the reviewers of this second book, so confident were they that slavery was the one and only possible reason for both Abraham Lincoln’s election to...