Which best describes the outcome of the 1913 case Guinn v. U.S.?

In Guinn v. United States (1915; sometimes dated to the case’s 1913 origins), the Supreme Court struck down Oklahoma’s grandfather clause. The clause exempted many white voters from literacy requirements while preventing many African Americans from voting. Its removal was a victory for civil rights because it overturned a law that restricted African American voting rights, matching choice C.

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