Native americans had slaves? Do you have any references to put in perspective and counter right wing boot licking perspectives on this matter? Like the issue is feudalism and capitalism/imperialism at the core. Like the natives had conflict… possibly scalped a few but I think the right wing on behalf of their “Yes big daddy” capo corpo masters like to paint images of a past a skew.
Slavery is hardly new, novel or confined to a single group of people. Slavery has been pretty common through out human history. So much so that we have archeological evidence of it back to Sumer. The real answer to someone bringing up slavery in other contexts is, “so what?” Yes, some native American tribes had slaves, that does not less the impact that slavery had on African people kidnapped and dragged to the Americas as slaves. Nor does it lessen the impact that a century of discrimination has wrought on Black Americans.
Honestly, it sounds like you have fallen into the Myth of the Noble Savage. Humans suck, we have always sucked, and that has been true across cultures. Every once in a while, we figure out how to suck less. But that tends to be rare, fragile and fleeting. Also, it’s often a lie and we just hide our suckage.