was the 17th president of the United States, serving from 1865 to 1869. Johnson assumed the presidency as he was vice president of the United States at the time of the assassination of Abraham Lincoln. A Democrat who ran with Lincoln on the National Union ticket, Johnson came to office as the Civil War concluded. He favored quick restoration of the seceded states to the Union without protection for the former slaves. This led to conflict with the Republican-dominated Congress, culminating in his impeachment by the House of Representatives, but he was subsequently acquitted in the Senate by one vote. Johnson's main accomplishment as president was the Alaska purchase.