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Abstract

For generations, the boundaries of the African-American race have been formed by a rule, informally known as the "one drop rule," which, in its colloquial definition, provides that one drop of Black blood makes a person Black. In more formal, sociological circles, the rule is known as a form of "hypodescent" and its meaning remains basically the same: anyone with a known Black ancestor is considered Black. Over the generations, this rule has not only shaped countless lives, it has created the African-American race as we know it today, and it has defined not just the history of this race but a large part of the history of America.

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