Yes. Nationality really doesn't mean anything in OOTP. The ethnicities are there to generate names and facegens, so they can be any nationality. Just add the namesets to the world_default.xml file and then either: (1) go to the nation editor in the game and add those ethnicities to the list of ethnicities for the United States; or (2) make the necessary changes to the world_default.xml file to add those ethnicities permanently to the United States.
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