True, and I bet in the Trump family there were Slave traders. If you look back further enough I believe everyone is a descendant of both a slave and slave owner.
There is a lot more history about Slavery than in just in the US. Only the US has detail records about it, thus easier to research.
What matters is how people view this practice now and understand the full history of it.
This article notes up front that it's specifically about slavery in America.
> What matters is how people view this practice now and understand the full history of it.
As an American, my take is that many Americans aren't bothered by it, in part because they don't know much about it. Many of those same people are laying a foundation that prevents current and future generations from learning about it, much less understanding it.
"The Reuters examination reveals how intimately tied America remains to the institution of slavery, including through the “people who make the laws that govern our country,” said Henry Louis Gates Jr, a professor at Harvard University who focuses on African and African American research and hosts the popular television genealogy show Finding Your Roots on PBS."