On January 1, 1863, the Emancipation Proclamation took effect, as President Lincoln declared all slaves on Confederate territory forever free. The declaration represented a shift in the President’s thinking.
On August 22, 1862, the President had said that his “paramount objective in fighting the war was to “save the Union,” and if he “could save the Union, without freeing any slave,” he would do it. The Emancipation Proclamation did not apply to slaves in the loyal Border States.