[AlexW]

“what would they be called to identify their origins and current status?”
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Well, many immigrants did, and still do, use their country of origin, most notably Irish-Americans.
With the blacks, very few know anything of their origins.
Obama, however, might list himself as Kenyan-American.

[TigersEye]

There is always someone who will take sarcasm seriously.

So, a white from South Africa would be a South African-American?