TRUTH? BLACKS have practiced, slavery far longer than any white nation on earth. The better question why did the blacks allow themselves to be taken as human slaves? They sold their enemies captured in battle between tribes to the WHITE MAN. Black's trapped and sold more blacks than any white man. Its kind'a like today...….in the name of black supremacy the blacks of this nation are killing more blacks than whites kill either through the practice of abortion or black on black crime.
The race of those taking others as slaves does not matter--it is evil no matter who does it. But, it cannot be undone--by elections, laws, or any other artificial means. We just have to wait for the slow evolution in social change.