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13th amendment.
The 13th Amendment to the Constitution declared that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction." -
14th amendment
The 14th Amendment to the Constitution was ratified on July 9, 1868, and granted citizenship to “all persons born or naturalized in the United States,” which included former slaves recently freed. -
15th amendment
The 15th Amendment to the Constitution granted African American men the right to vote by declaring 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." -
Plessy v Ferguson
This was a petition for writs of prohibition and certiorari, originally filed in the Supreme Court of the State by Plessy, the plaintiff in error, against the Hon. John H. Ferguson, judge of the criminal District Court for the parish of Orleans.