Who abolished slavery when he issued the emancipation proclamation in 1863, this meant that slavery could continue in the United States

Lincoln

Explanation:

Three days later, Lincoln went public with the preliminary Emancipation Proclamation, which called on all Confederate states to rejoin the Union within 100 days—by January 1, 1863—or their slaves would be declared “thenceforward, and forever free.”

honeslty bro its the same thing

i believe the answer is a