Slavery during the American Civil War Slavery during the American Civil War 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, slaves played an active role in their own emancipation, and thousands of slaves escaped from bondage during the war. On January 1, 1863, President Abraham Lincoln announced the Emancipation Proclamation, making
Names of the American Civil War American flag". Given that in the free states non-Yankee groups – Germans, Dutch-Americans, New York Irish and southern-leaning settlers in Ohio, Indiana and Illinois – showed majority opposition to waging the Civil War, other Confederate sympathizers have used the name "War of Yankee Aggression" or "Great War of Yankee Aggression" to indicate the Civil War as a Yankee war, not a Northern war "per se". Conversely, the "War of Southern Aggression" has been used by those who maintain that the Confederacy was the belligerent party. They maintain the thought that the Confederacy started the war when they initiated combat at