One hundred fifty years after the Civil War began, we’re still fighting it — or at least fighting over its history. I’ve polled thousands of high school history teachers and spoken about the war to audiences across the country, and there is little agreement even about why the South seceded. Was it over slavery? States’ rights? Tariffs and taxes?

As the nation begins to commemorate the anniversaries of the war’s various battles — from Fort Sumter to Appomattox — let’s first dispense with some of the more prevalent myths about why it all began.

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