The definition of blackness in the United States has always been that an individual is black if at least one or more of the person's parents is black.

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The definition of blackness in the United States has historically been influenced by the "one-drop rule," which posited that any person with even one ancestor of African descent is considered black. This rule was not based on the presence of one or more black parents per se, but rather on the presence of any African ancestry.

The Definition of Blackness in the United States Has Always