The Thirteenth Amendment to the United States Constitution abolished slavery and involuntary servitude, except as punishment for a crime. The amendment was passed by Congress on January 31, 1865, and ratified by the required 27 of the then 36 states on December 6, 1865, and proclaimed on December 18.
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Explanation: The Proclamation itself freed very few slaves, but it was the death knell for slavery in the United States. Eventually, the Emancipation Proclamation led to the proposal and ratification of the Thirteenth Amendment to the Constitution, which formally abolished slavery throughout the land.