The abolition of slavery in the US is unfortunately a more complicated story than most people are aware.

The 13th amendment removed the legal concept of slavery (except for convicts) but it was still not a crime to do slavery. Slavery changed shape many times over the years since the civil war (usually involving convicting black people under sham crimes and then selling them as debt slaves or forcing them to sign contracts that rendered them slaves under threat of being convicted for said sham crimes) and can only reasonably be said to have actually ended in the US after Pearl Harbour when concerns that it would be used as enemy propaganda caused the Justice Department to properly prosecute slave owners (see Circular 3591[1]).

The last chattel slave in the US was Alfred Irving[2] and he was released in late 1942. He was kept in chains and was permanently disfigured due to constant physical abuse from his owners. He died in 1960.

[3] is a very comprehensive video essay about the topic.

[1]: https://en.wikisource.org/wiki/Circular_No._3591 [2]: https://en.wikipedia.org/wiki/Alfred_Irving_(former_slave) [3]: https://www.youtube.com/watch?v=j4kI2h3iotA