In the U.S. Supreme Court case of Guinn v. United States (1915), the court ruled that

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The Supreme Court in Guinn v. United States (1915) ruled that the grandfather clause, which exempted certain voters from literacy tests and other voting requirements if their ancestors had the right to vote before the Civil War (thereby disenfranchising many African-American voters), was unconstitutional. This decision was based on the violation of the Fifteenth Amendment, which prohibits denying the right to vote based on race, color, or previous condition of servitude.

In the US Supreme Court Case of Guinn V