During slavery, there could have been a mulatto person, who because of the one-drop rule, was considered black.

This period marked the rise of the so-called "one-drop rule" - which defined as black anyone with any African heritage at all.

The "one-drop rule" has been stripped of its worst penalties.

Delegates debated a proposal for a one-drop rule in these laws.

The one-drop rule and its consequences have been the subject of numerous works of popular culture.

It has been a reverse kind of one-drop rule.

Prior to the one-drop rule, different states had different laws regarding color.

For African Americans, the one-drop rule was a significant factor in ethnic solidarity.

On the other hand, the 20th-century one-drop rule made it relatively difficult for anyone of known Black ancestry to be accepted as White.

The one-drop rule was an example of hypodescent classification that often went against appearances and the community with which a person identified.