Yes. It freed us all. There are no slaves still alive.
Not in the US, but there are plenty of slaves being held around the world today. They're still bought and sold in markets in the Middle East. This is of zero interest to Antifa and BLM.
Actually, I'm pretty sure the slave trade is still active all over the world. We changed the name to "human trafficking" and it is illegal now, but still seems to be a problem.
As for D.L. Hughley, I would say that unless he is a current victim of human trafficking, any non-freedom that he feels is self-imposed.