Why was the 13th Amendment significant?

The 13th Amendment was necessary because the Emancipation Proclamation, issued by President Abraham Lincoln in January of 1863, did not end slavery entirely; those ensllaved in border states had not been freed. ... The 13th Amendment forever abolished slavery as an institution in all U.S. states and territories.

Explanation:

i can't beat you to a pulp if i'm not close enough.

i think the answer is a and i hope this ; ))