Actually, Lincoln’s Emancipation Proclamation immediately freed 50k to 75k slaves in territories under Union control but not specifically excluded from the EP. These were mostly in the Mississippi Valley and along the coast.
As the Union armies advanced, more and more slaves were freed. By the end of the war, something well over 3M slaves had been freed by the Emancipation Proclamation.
Those are the facts, no matter how much you dislike them.