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 and "War Between the States" have been used jointly in some formal contexts. For example, to mark the war's centenary in the 1960s, the State of Georgia created the "Georgia Civil War Centennial Commission Commemorating the War Between the States". In 1994, the U.S. Postal Service issued a series of commemorative stamps entitled "The Civil War/The War Between the States". During and immediately after the war, U.S. officials, Southern Unionists, and pro-Union writers often referred to Confederates as "Rebels". The earliest histories published in northern U.S. states commonly refer to the American Civil War as "the Great Rebellion" or "the