Lumen 21-4, 3.0 A Timeline for the End of Slavery in the United States Posted – August 13, 2021 Irrelevant tid bit – Natural resources are not given to us by our fathers, they are loaned to us by our children. When did slavery end in the United States? The 13th Amendment to the U.S. Constitution was ratified on December 6, 1865.abolishing slavery throughout the U.S. except for prisoners. (This is a topic for another time.) But getting there was confusing and not a straight line. In 1776 when the U.S. declared itself free from Great Britain, all 13 of the original states were slave states – Connecticut, Delaware, Georgia, Massachusetts (included Maine), Maryland, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, and Virginia (included West Virginia and most of Kentucky). By the start of the Civil War an additional 12 free and 9 slave states had been admitted to the United...