FYI, Maryland, Delaware, Kentucky and Missouri remained in the Union during the war and were also slave states. In addition, Lincoln's Emancipation Proclamaion was written only for the slaves in the South. Those in the North were excluded. Of course, as everyone knows, the Proclamation freed no one; it was only used in an attempt to incite insurrection among the slaves.
Yeah. The slaves were freed by Jefferson Davis, I guess. Lincoln had nothing to do with it. Hooboy...
Charles Sumner, William Lloyd Garrison, Wendell Phillips, Gerrit Smith, and the whole anti-slavery phalanx at the North, had denounced this policy, and had besought Mr. Lincoln to adopt an opposite one, but in vain. Generals, in the field, and councils in the Cabinet, had persisted in advancing this policy through defeats and disasters, even to the verge of ruin. We fought the rebellion, but not its cause. And now, on this day of January 1st, 1863, the formal and solemn announcement was made that thereafter the government would be found on the side of emancipation. This proclamation changed everything."
--Life and Times, Frederick Douglass
I guess someone should have told Douglass that the Emancipation Proclamation did nothing to free the slaves.
Lincoln had no Constitutional power to free slaves in non-rebel states without a Constitutional Amendment.