"the Emancipation Proclamation is often a widely misunderstood document. So, it did not, sort of wholesale, free the enslaved people throughout the Union. It did not free enslaved people in the Union. In fact, there were several border states that were part of the Union that continued to keep their enslaved laborers, states like Kentucky, states like Delaware, states like Missouri. And what it did was it was a military edict that was attempting to free enslaved people in Confederate territory. But the only way that that edict would be enforced is if Union soldiers went and took that territory."
January 1, 1970
https://en.wikiquote.org/wiki/Emancipation_Proclamation