This article is very American first and very much for the American racial politics which does not really apply everywhere else

For Europe from 476 AD to 1945 Europe was engulfed in non-stop conflicts to see who unite the continent

Very similar to China's warring States period and spring and autumn period

The Nation's and kingdoms of Europe where in a fight to see whom would rule Europe and it was a fight that spread to the rest of the world

I would add that Irish people were also used as slaves in the early American colonies