Last year I visited a slave castle in Ghana--where slave traders forced captives onto boats headed for the Americas.
This week, I saw the place in Charleston Harbor where around 40% of the slaves brought to the US entered the country. It was a sobering experience. (Sorry, I don't have a picture.)
I also visited the only remaining "slave mart" in Charleston (now a museum):
Slave traders used to sell humans here, just like cattle. Here's an old advertisement for a sale:
Oh what pain humans inflict on each other but as Maya said History cannot be unlived. It's an embarrasment and a shame but we hopefully have moved past that.