1875: Andrew Johnson, who served as the 17th U.S. president from 1865 to 1869, dies at age 66 in Elizabethton, Tenn., following a stroke. Johnson was Abraham Lincoln's vice president for just over a month when he became president upon Lincoln's assassination. After coming into conflict with the Republican-dominated Congress over Reconstruction, he was impeached by the U.S. House of Representatives, becoming the first president to be impeached, although he was acquitted in the Senate by one vote. Johnson also twice served as Tennessee's governor, the second time from 1862 to 1865 as military governor after the state had been retaken, and represented the state in the U.S. House and the U.S. Senate. He had been elected to the Senate again in 1875 (the only former president to serve there), just months before his death.