9 h 47 m, 31 ene 1865 año - Thirteenth Amendment abolishes
slavery
Descripción:
 The Thirteenth Amendment (Amendment XIII) to the United States Constitution abolished slavery and involuntary servitude, except as punishment for a crime. In Congress, it was passed by the Senate on April 8, 1864, and by the House on January 31, 1865. 
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9 h 47 m, 31 ene 1865 año
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 ~ 160 years ago