When did America End Slavery?

The United States of America ended slavery on December 6, 1865.

The Thirteenth Amendment (Amendment XIII) to the United States Constitution abolished slavery and involuntary servitude, except as punishment for a crime. It was passed by the Congress on January 31, 1865, ratified by the required 27 of the then 36 states on December 6, 1865, and proclaimed by the then Secretary of State William H. Seward on December 18, 1865.