A new study demonstrates the strong influence ancestry plays in Americans' interpretation of whether someone is black, white or multiracial, highlighting differences in the way race is socially constructed in the U.S. compared to other parts of the world.

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A new study demonstrates the strong influence ancestry plays in Americans' interpretation of whether someone is black, white or multiracial, highlighting differences in the way race is socially constructed in the U.S. compared to other parts of the world.