Which president survived an assassination attempt by John Hinckley Jr. in 1981?

Who assassinated Abraham Lincoln? In which theater was Abraham Lincoln shot in 1865? In which city was John F. Kennedy assassinated in 1963? Who was accused of assassinating John F. Kennedy? Which presidents have been impeached by the House of Representatives? Who was the first president to be impeached? Which president was impeached twice? Which president served the shortest time in office?