Why did Lincoln announce Emanicpation Proclamation?

Lincoln announced the Emancipation Proclamation primarily to weaken the Confederacy during the Civil War by freeing enslaved people in the rebel states. He believed that emancipation would undermine the South's labor force and bolster the Union's moral cause. Additionally, it aimed to deter foreign powers from recognizing or supporting the Confederacy, framing the war as a struggle for freedom. Ultimately, the proclamation also set the stage for the eventual abolition of slavery in the United States.