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Slavery in the United States was officially abolished when the Thirteenth Amendment to the U.S. Constitution was ratified.

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Slavery in the United States
The legal institution of human chattel slavery, comprising the enslavement primarily of Africans and African Americans, was prevalent in the United States of America from its founding in 1776 until 1865, predominantly in the South. Slavery was established throughout European…Source: Wikipedia (CC BY-SA)
Thirteenth Amendment to the United States Constitution
1865 Reconstruction amendment
The Thirteenth Amendment 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…Source: Wikipedia (CC BY-SA)
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