There was one central reason the Civil War happened.
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What if the 2024 Election leads to a Second American Civil War? An AU made by me! (Lore in Comments) : r/AlternateHistory
American Civil War: A History From Beginning to End (Fort Sumter, Abraham Lincoln, Jefferson Davis, Confederacy, Emancipation Proclamation, Battle of Gettysburg): Freeman, Henry: 9781532874000: : Books
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What really started the American Civil War?
The Trent Affair: Diplomacy, Britain, and the American Civil War - The National Museum of American Diplomacy