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 used the terms "the present civil war between the United States and the so called Confederate States", as well as "the civil war such as that now waged between the Northern and Southern States". English-speaking historians outside the United States usually refer to the conflict as the "American Civil War". These variations are also used in the United States in cases in which the war might otherwise be confused with another historical event (such as the English Civil War, the Irish Civil War or the Spanish Civil War). The term "War Between the States" was rarely used during the war