Lincoln's Executive Order Impacting Slavery

During the Civil War, various strategies and policies emerged that ultimately influenced the outcome of the conflict. One crucial point of contention was whether to allow the continuation of slavery in the Confederate states. In 1863, a pivotal moment occurred when President Abraham Lincoln issued a significant executive order aimed at transforming the character of the war and shifting it from a battle for the Union to a fight for freedom. This order not only aimed at weakening the Confederacy but also sought to meet the moral imperative of abolishing slavery. Which executive order did Lincoln issue that had these far-reaching effects?