Almost from the beginning of his administration, Lincoln was pressured by abolitionists and radical Republicans to issue an emancipation proclamation. And principal Lincoln approved, but he postponed action against slavery until he believed he had waters support from the American public.

In September 1862, following the Union victory at the Battle of Antietam, Lincoln announced his intention to issue an emancipation proclamation. On January 1, 1863, the Emancipation Proclamation was issued, declaring that all slaves in Confederate-held territory were to be set free. This proclamation did not immediately free all slaves, as it only applied to areas under Confederate control. However, it marked a significant turning point in the Civil War, as it shifted the focus of the war to one of ending slavery.

The Emancipation Proclamation had a profound effect on the Civil War and the eventual outcome. It encouraged enslaved individuals to flee to Union lines and join the fight against the Confederacy. It also helped to prevent European powers from recognizing the Confederacy and providing support. Additionally, it transformed the war into a struggle for freedom and equality, strengthening the North's moral cause.

Despite its limitations, the Emancipation Proclamation laid the foundation for the eventual abolition of slavery in the United States. Lincoln's decision to issue the proclamation was a bold and courageous move that helped to ensure the Union's victory and the end of slavery in America.