Slavery has not gone away. Much depends on how you interpret “involuntary servitude”.
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.
I refer to modern slavery as being state-of-the-art since these more subtle forms morphed or evolved directly sub umbra from that overt form of chattel slavery so familiar to public school students.
I do this only to provoke serious thought and earnest conversation.
Slavery has not gone away; but it is state-of-the-art.