Thirteenth Amendment to the United States Constitution
https://en.wikipedia.org/wiki/Thirteenth_Amendment_to_the_United_States_Constitution
The Thirteenth Amendment (Amendment XIII) to the United States Constitution abolished slavery and involuntary servitude, except as punishment for a crime. The amendment was passed by the Senate on April 8, 1864, by the House of Representatives on January 31, 1865, and ratified by the required 27 of the then 36 states on December 6, 1865, and ...
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