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Watch this West Point professor sternly explain why the Civil War was about slavery

Next time someone tries to say the Civil War wasn't about slavery, here's your stern retort, courtesy of West Point.

"There has to be another reason, we are told. Well, there isn't," Colonel Ty Seilude, head of West Point's history department, says, looking into the camera in his dress blues. "Slavery was the single most important cause of the Civil War."

Watch the military historian explain why below. Nico Lauricella