Slavery is not unique. Since the dawn of recorded history mankind has practiced slavery. Whites did it to whites, blacks did it blacks, Indians did it to Indians, Asians did it Asians and every combination of all those combined did it to each other.
What is unique in the history of mankind is the abolition of slavery. And there is one thing in common that spawned the change. Christianity. Christianity forced the longest running practice to become despised in the civilized world.
What is unique in the history of mankind is the abolition of slavery. And there is one thing in common that spawned the change. Christianity. Christianity forced the longest running practice to become despised in the civilized world.