Slaves? What slaves? I have never owned any slaves. Neither have any of my parents, grand parents, or great-grand parents. Don't know beyond that, but above that they were broke, so I doubt they spent money on slaves. Both above are self-made, too.
"Lack" of slavery in non-white cultures? It was RAMPANT with both the Africans and the Native Americans...raiding other tribes for slaves was part of daily life for the Indians. We just showed them how to make it more profitable. Not justifying it at all