Which rights and guarantees were secured by the fifteenth amendment to the us constitution?

The Fifteenth Amendment to the US Constitution guarantees that no citizen will be denied the right to vote based upon their "race, color, or previous position of servitude." The Amendment was ratified on February 3, 1870 and was the third and final Reconstruction Amendment. This amendment was a major amendment in advancing racial equality in the United States in that it guaranteed African Americans the right to vote. However, it would continue to take years before the spirit of this law was fully implemented and continues to be challenged today in the courts. 

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