helm gnaw The “one-drop rule” is a social rule that has persisted since the times of the Civil War. Its main idea is that biracial people, regardless of how far back their ancestry can be traced, are viewed as part of any minority group their ancestors may be part of. This can be seen not only in how we treat people on the outside, but also in how we label ourselves and others: many “minority” celebrities, who are actually biracial, are infrequently viewed as such, instead falling victim to this rule.