Which amendment to the Constitution allowed Congress to make laws necessary to affirm the voting rights of all freed men?

Question

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The Fifteenth Amendment, ratified in 1870, prohibited the federal and state governments from denying a citizen the right to vote based on "race, color, or previous condition of servitude." It gave Congress the power to make laws necessary to enforce this amendment, which reaffirmed the voting rights of all freed men, including African Americans.

Which Amendment to the Constitution Allowed Congress to Make Laws