President Lincoln issued the Emancipation Proclamation on January 1, 1863. This document declared free all slaves living in the southern states (essentially, all territory that had seceded from the Union). While the idea behind the document and speech was impassioned and helped fuel the abolition movement throughout the Civil War, it actually accomplished very little. Because the Southern states had seceded from the Union, they no longer followed the laws of the United States (they had formed their own government - the Confederate States of America). Additionally, the Emancipation Proclamation did not apply to slaves in the border states that were fighting on the Union's side- some of which still had slavery. Considering Lincoln had no ability to enforce this proclamation in southern states, the order was not acted upon.
One positive that the emancipation proclamation had was to show Lincoln's resolve to end slavery. The abolition movement was a key component to why the Civil War began, and war would continue until slavery ended.
So how did Lincoln maintain freedom for slaves? Well, by having the Union continue fighting until the South conceded defeat at the Appomattox Court House. The Emancipation Proclamation served as his statement of intent on ending slavery in the United States. Abolition occurred on December 18, 1865 with the passage of the 13th amendment to the Constitution.
Lilcoln maintained the freedom of slaves by passing the emancipation proclamation.
The emancipation proclamation. made it so that by January 1st 1863, any slave state that was still in war with the union would be free of slavery. This guaranteed that all slaves would be free. Also he passed the 13th amendment which abolished slavery.