With the assassination of President Abraham Lincoln, Andrew Johnson became the 17th President of the United States (1865-1869), an old-fashioned southern Jacksonian Democrat of pronounced states’ rights views. After Lincoln’s death, President Johnson proceeded to reconstruct the former Confederate States while Congress was not in session in 1865. He pardoned all who would take an oath of allegiance, but required leaders and men of wealth to obtain special Presidential pardons. The Radicals’ first step was to refuse to seat any Senator or Representative from the old Confederacy. Next they passed measures dealing with the former slaves. Johnson vetoed the legislation. The Radicals mustered enough votes in Congress to pass legislation over his veto–the first time that Congress had overridden a President on an important bill. They passed the Civil Rights Act of 1866, which established Negroes as American citizens and forbade discrimination against them.