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 amendment specifically allows it, my friend.

USA has one of the highest prison populations per capita in the world. Further, the only countries that outpace it are small, smaller than most US states. Cuba, Rwanda, El Salvador, Turkmenistan, and American Somoa are the only countries with higher prison populations per capita, and those are all much smaller counties than USA.

Why do you think the right wing wants to criminalize everything? Because the more people are in prison, the more free labor you have.