You don't have to be a paragon of good behavior to be elected (or not) to lead a country, but your conduct while in office must be somewhat in keeping with the standards set by your predecessors. These government officials were forced to resign for scandalous behavior that destroyed the electorate's trust or for making poor governing decisions.
In 1863, after leading the Union to victory in the American Civil War, Abraham Lincoln urged the nation to heal its wounds and restore peace—making a proclamation the country had been long waiting for.
March 30, 1981: On that day in Washington D.C. John Hinckley Jr. shot, and wounded, President Ronald Reagan. Why did he do it? What lead up to it and what happened after?