A Unionist Democrat from Tennessee, Andrew Johnson was put on the ticket by Lincoln in 1864 in an effort to reach union sympathizers in the Border States. Challenges: Andrew Johnson had to navigate ...

Andrew Johnson never expected to be president. But just six weeks after becoming Abraham Lincoln's vice president, the events at Ford's Theatre thrust him into the nation's highest office.

For the first time in history, the United States House of Representatives impeached a sitting president, Democrat Andrew Johnson ... Booth assassinated Abraham Lincoln, on April 15, 1865.