A bold claim, but look at the facts:
Yes some will argue that the slaves weren’t freed, and that legally every one in the US was made in to slave post civil war.
War on drugs was a Regan initiative, well really he just expanded it more.
There are as many black men enslaved today in prisons as there were black male slaves before the civil war;
furthermore most of the prison population are in the same places that held the largest populations of slaves pre civil war.