Did the 13th amendmend advance or obstruct the struggle for equality?

The 13th amendment states that "neither slavery nor involuntary servitude" should occur or exist in the United States of America.

This is an advancement since it made slavery illegal, which was a huge leap in the struggle for inequality.

The exact words of the 13th amendment:

" 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."

The 13th amenfmenent advanced.