Which constitutional amendment guaranteed voting rights to African Americans, including freed slaves?

Question

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The Fifteenth Amendment to the United States Constitution, ratified in 1870, guaranteed African American men the right to vote by stating that the "right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude."

Which Constitutional Amendment Guaranteed Voting Rights to African Americans, Including