In this 6 minute video, Col. Ty Seidule, head of the department of history at the U.S. Military Academy at West Point, takes on the claim that the Civil War was about something other than slavery. He begins:

Was the American Civil War fought because of slavery. More than 150 years later, this remains a controversial question. Why? Because many people don’t want to believe that the citizens of the southern states were willing to fight and die to preserve a morally repugnant institution. “There has to be another reason,” we are told. Well, there isn’t.

He goes on to use strong logic and documentation — speeches, secession documents, the Emancipation Proclamation, and more — to make a convincing case that the Civil War was about “slavery and just slavery.”  He finishes:

Slavery is the great shame of America’s history. No one denies that. But it’s to America’s everlasting credit that it fought the most devastating war in its history in order to abolish slavery. As a soldier, I am proud that the United States army — my army — defeated the confederates. In its finest hour, soldiers wearing this blue uniform, almost 200,000 of them former slaves themselves, destroyed chattel slavery; freed four million men, women, and children from human bondage; and saved the United States of America.

Wow.

Watch it all:

Lisa Wade, PhD is a professor at Occidental College. She is the author of American Hookup, a book about college sexual culture, and a textbook about gender. You can follow her on Twitter, Facebook, and Instagram.