Final answer:
The Thirteenth Amendment abolished slavery throughout the entire United States, including in the North, in December 1865 after the Civil War.
Step-by-step explanation:
The Thirteenth Amendment officially abolished slavery throughout the United States, including in the North. Even though President Abraham Lincoln had previously issued the Emancipation Proclamation, this document specifically freed those enslaved in rebellious states and did not abolish the institution of slavery as a whole. It wasn't until the passage of the Thirteenth Amendment in December 1865, after Lincoln's assassination and the end of the Civil War, that slavery was formally ended in all states, ensuring that "neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction."