Not to mention, the enslavement of Africans in the USA remains stamped upon the ongoing reconstruction of racist power structures.
I am basically Scots-Irish (along with a whole lot of other stuff). Even if there were at some point in the long distant past that my ancestors were enslaved by someone somewhere, the experience of that has long been eradicated from the social memory.
As such, it has NO PRESENT IMPACT on us.
The fact of African slavery and its impact on current conditions LOOMS very LARGE in the present.
To have any point of comparison, the impact of any and all the other prior social/cultural/political experiences with slavery would have to REMAIN PRESENT TODAY.