Which court case or legal action brought the Fourteenth and Fifteenth Amendments back to life?

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Guinn v. United States (1915) brought the Fourteenth and Fifteenth Amendments back to life by declaring certain voting restrictions unconstitutional. The case challenged an Oklahoma law that required potential voters to pass a literacy test, but only for African Americans, as white voters were exempted from the law. The Supreme Court ruled that such a law violated the Fifteenth Amendment, which prohibits racial discrimination in voting. This decision helped pave the way for future civil rights cases and enforcement of voting rights for all citizens.

Which Court Case or Legal Action Brought the Fourteenth and Fifteenth