I had the impression that (at least some of) those groups contain people of mixed ancestry including European ancestry.
Am I wrong? Is the child of a white person and a black person not considered black in the US? Is that not the case form the other groups too?
Mixed Race is a separate census designation which represents an additional 10% of the US.
Either way Europeans overestimate American ties to Europe. If you actually visit America in 2026, most culture is either domestic, Asian, or Latino.
Heck, the majority of Americans began viewing Asia and not Europe as America's most important partners back in 2009 [0].
[0] - https://www.politico.eu/article/americans-turn-their-backs-o...