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As someone who grew up in the US and studied in the UK for some time, it was interesting to see mixed race people have a separate identity from black.
I've always associated mixed race with black, but I guess that's partly because the very archaic one-drop rule has shaped racial identity in America. Also, at the same time you can have AfrAms who look very "mixed" but have two black parents. This dates back to generations of mixing.
Identifying mixed with black also strengthened the civil rights movement. The UK had never gone through a black consciousness movement like that. So I can tell you for a fact when I was there, mixed people whether by society or personally projected a different identity from simply being "black".
The one issue with this one-drop sort of racial categorization is that if a "mixed" person ends up having a child with a white person, that child is phenotypically white. How can you still call their offspring a black child? It wouldn't make sense.
Maybe some but generally that is in your head.