Because It was applied only to states that had seceded from the Union, leaving slavery untouched in the loyal border states. ... By the end of the war, almost 200,000 black soldiers and sailors had fought for the Union and freedom.
The Emancipation Proclamation was limited in many ways but the main reason was because it only applied to enslaved people living under the Confederacy. It also applied to states that had left from the Union.
