Final answer:
The Emancipation Proclamation, issued by Lincoln after the perceived Union victory at Antietam, intended to free all slaves in areas still in rebellion against the Union.
Step-by-step explanation:
The Emancipation Proclamation, issued by Lincoln after the perceived Union victory at Antietam, intended to free all slaves in areas still in rebellion against the Union. It stated that on January 1, 1863, all persons held as slaves within any state or part of a state where the people were in rebellion against the United States would be “thenceforward, and forever free.” However, it is important to note that the Emancipation Proclamation did not immediately free all slaves as it only applied to areas under Confederate control and exempted border states that were not in rebellion.