William McKinley, the 25th President of the United States, giving his last public address at the Pan-American Exposition in Buffalo, New York, standing under the gazebo, hatless, wearing a tuxedo and holding speech notes in his hand, one day before he was shot on September 6, 1901. One bullet was extracted, but the second was not, and McKinley eventually died of gangrene from his wound, eight days later.Photo credit: Charles Dudley Arnold