On Sept. 6, 1901, President William McKinley was shot and mortally wounded by anarchist Leon Czolgosz at the Pan-American Exposition in Buffalo, New York. (McKinley died eight days later; Czolgosz was executed on Oct. 29.)

In 1909, American explorer Robert Peary sent a telegram from Indian Harbor, Labrador, announcing that he had reached the North Pole five months earlier.

In 2002, Congress convened in New York to pay homage to the victims and heroes of September 11.

In 2006, President George W. Bush acknowledged for the first time that the CIA was running secret prisons overseas.

In 2017, Hurricane Irma, the most powerful hurricane ever recorded in the Atlantic, pounded Puerto Rico with heavy rain and powerful winds; authorities said more than 900,000 people were without power.