The one-drop rule was used for the purpose of identification of a person's racial ethnicity under the specified black codes.
What is the one-drop rule?
The one-drop rule was a social principle in the US relevant before the 20th century, which stated that if even one ancestor of a person is black, then the person will also be considered as a black under this rule.
Hence, the significance of one-drop rule is aforementioned.
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