What do we call the practice in the United States of assigning race to the parent believed to pertain to a minority group (known also as the "one drop rule")?

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The practice in the United States of assigning race to the parent believed to pertain to a minority group, known as the "one drop rule," is called hypodescent. Hypodescent refers to the assignment of children to the minority group of their perceived "lesser" parent, often based on a social or cultural definition of race rather than genetic or biological factors.

What Do We Call the Practice in the United States