Slavery goes back to the dawn of time, and was often far more brutal than slavery in America, which was only a relic of the British Empire. Slavery of Africans was mainly a result of other Africans, who sold some of their slaves to the Arabs, who in turn sold some of theirs to Europeans. Arabs also enslaved Europeans, which history (as told by liberals) has all but been forgotten.
AND...why did it take some WHITE guys in the 1800s to get rid of Slavery that had been around for eons???