President Abraham Lincoln issued the Emancipation Proclamation on January 1, 1863, declaring freedom for enslaved persons in rebellious Confederate states. The proclamation changed the legal status of more than 3.5 million enslaved African Americans in secessionist territories and shifted the Civil War's focus from preserving the Union to also ending slavery. The order exempted border states and Union-controlled Confederate areas but enabled Black soldiers to join the Union Army, contributing to slavery's complete abolition through the Thirteenth Amendment in 1865.