Many people still believe that the Civil War wasn’t about slavery, but about something totally different. They can’t fathom that the citizens of southern states were willing to fight and die to preserve a morally repugnant institution. Some argue the cause of the war was economic. The North was industrial and the South was agrarian. Is this what brought both sides to war? Or was it because the South believed strongly in preserving states rights? Colonel Ty Seidule, professor of history at the U.S. Military Academy at West Point, debunks all these beliefs. “The evidence is clear and overwhelming,” says Seidule. “Slavery was, by a wide margin, the single-most important cause of the Civil War for both sides.” Seidule elaborates in this edition of Prager University.