Slavery during the American Civil War
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Slavery played the central role during the American Civil War. The primary catalyst for secession was slavery, especially Southern political leaders' resistance to attempts by Northern antislavery political forces to block the expansion of slavery into the western territories. Slave life went through great changes, as the South saw Union Armies take control of broad areas of land. During and before the war, enslaved people played an active role in their own emancipation, and thousands of enslaved people escaped from bondage during the war.
For a related subject, see Military history of African Americans in the American Civil War.