Thirteenth Amendment to the United States Constitution
The election of 1864 united War Democrats with the GOP and saw Lincoln and Tennessee Democratic Senator Andrew Johnson get nominated on the National Union Party ticket; Lincoln was re-elected. Under Republican congressional leadership, the Thirteenth Amendment to the United States Constitution—which banned chattel slavery in the United States—passed the Senate in 1864 and the House in 1865; it was ratified in December 1865.