Pretty sure these are just the US Census categories, which is the most consistently used grouping of people in the United States. There are meaningful ethnic d

Pretty sure these are just the US Census categories, which is the most consistently used grouping of people in the United States. There are meaningful ethnic disparities between say, Black and White Americans; and those are the categories because national origin is a lot harder to measure, particularly for the descendants of people enslaved before any of the countries of modern Africa existed.