Secessionist inclinations are on the rise in the United States, and are sure to intensify after Nov. 5 regardless of which party prevails. When that happens, you can expect the accompanying discourse will be peppered with assertions that states have no right to secede, with many declaring the question was “settled” by the Civil War. The embedded contention that legal and moral questions are rightly and permanently settled by the outcome of a mass-murder contest is absurd on its face. However, the notion is so widely and casually embraced that it invites an emphatic response. It also serves...
