If you thought slavery was outlawed in America, you would be wrong. The 13th amendment to the Constitution states that "...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 … ."
In plain language what that means is slavery in America can still exist for those who are in a prison, where you basically lose all of your rights. (You don’t gain a lot of your rights back when you get out of prison, either, but that is a different story.) So, given the country’s penchant for rapacious capitalism, it may not come as a surprise that there is much of the American prison system that exploits American prisoners much like slaves.