Andrew Johnson"Sir Veto"

16th Vice President of the United StatesAndrew Johnson was born December 29, 1808, into deep poverty and never attended school, teaching himself to read and write with his wife's help after they married; he remains the least formally educated U.S. president. He worked as a tailor before entering Tennessee politics, rising through local office to Governor of Tennessee and then U.S. Senator. As the only Southern senator to remain loyal to the Union during the Civil War, Lincoln chose him as a running mate in 1864 to build a unity ticket, and Johnson became President in April 1865 after Lincoln's assassination. His presidency (1865–1869) was consumed by bitter conflict with Congress over Reconstruction policy, as he favored a lenient approach toward the former Confederacy and resisted protections for newly freed Black Americans, leading the House to impeach him in 1868 — he survived removal from office by a single vote in the Senate trial. He did not win his party's nomination for a full term and left office deeply unpopular, though he later became the only former president to be elected back to the U.S. Senate, in 1875.