The "one-drop" rule helps explain what about Barack Obama?

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The "one-drop" rule, a social and legal principle of racial classification that was historically prominent in the United States, posits that any person with even one ancestor of sub-Saharan African ancestry ("one drop" of African blood) is considered Black. This rule explains why Barack Obama, despite being biracial with a White mother and a Black father, was labeled the first Black president of the United States.

The "One-Drop" Rule Helps Explain What About Barack Obama