Humans have acted inhumanely throughout history. To say that stating this fact means one is defending abuses that took place in the "New World" is absurd.
Everyone had slaves at some time. Everyone conquered the land they lived on at some time. It will only serve to continue bitterness and violence to do anything other than learn our lessons, forgive ourselves and each other, and not repeat the mistakes.
Those who wish to prolong the process do so for nefarious purposes.
Oh boy. here we go with the everybody in history has had slaves garbage. We're 160 years past slavery and the issue is the impact of white racism since slavery that has negatively impacted people of color now. Things like, black codes, vagrancy laws, contract labor, share cropping, the company store, racial massacres by whites, racist public policy, restrictive covenants, redlining, contract selling, racist housing policy, and modern or aversive racism. Slavery is long been out of the picture. Those who keep wanting to limit this to a discussion of slavery are the ones doing so for nefarious purposes.