Which constitutional amendment outlawed slavery in the united states

Thirteenth Amendment to the United States Constitution

written by President Abraham Lincoln.

Explanation:

Thirteenth Amendment to the United States Constitution. 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.The amendment was ratified by the required number of states on December 6, 1865.in the entire United States. ... Despite the 13th Amendment, vestiges of racial discrimination and inequality would continue to exist in America well into the 20th century.

President Abraham Lincoln approved the Joint Resolution of Congress submitting the proposed amendment to the state legislatures.