Extra fun fact. For a while in many places neither group were considered "white". Black and Muslim is the new Italian or Scott/Irish.

If there's one thing that living in that country during the Leave Referendum has taught me, is that Racism in Britain is far more fine grained than merelly skin color: basically there is a prevalent idea amongst mainly the English (also amongst those of the other nations, but it's less common) that they're inherently superior to everybody else but Americans.