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MMMski
Hello! 

The 13th Amendment, which banned slavery, was officially passed on December 6th of 1865. This date is when the slaves were freed. 

I hope this helps you! Have a great day!
-Mal
Due to Union measures such as the Confiscation Acts and Emancipation Proclamation in 1863, the war effectively ended slavery, even before ratification of the Thirteenth Amendment in December 1865 formally ended the legal institution throughout the United States.