The greatest sin perpetrated on Mankind is religion.
Slavery was purported to have been a great sin but slavery never was for economic reasons alone.
It was mostly a tool. A recruiting drive carried out by whites in order to kidnap blacks, educate/brainwash them into believing the old crap about THEIR god Jesus and then have them set free to poison the rest of their own kind.
It appears to have worked.
Don't forget. You read it here first.
Anthony W. Allsop (Genesis)