This past Tuesday marked the 150th anniversary of the Emancipation Proclamation, issued in 1863 by President Lincoln during the American Civil War. Freeing the slaves in Confederate states, the proclamation was a pivotal moment in the war. By adding moral weight to the Union’s struggle and ending any realistic chance of Confederate-friendly European powers officially recognizing the Confederacy and entering into the conflict on its side, it arguably guaranteed Federal victory.

Learn more about slavery and the Civil War with these titles, available in the Amazing History offer:

10 Days: Abraham Lincoln, available as part of the 10 Days Biography Pack

Civil War Pack (includes Ten Greatest Battles and Ten Greatest Heroes)

Civil War Blast from the Past Kit

What Was the Battle of Gettysburg?