1. The Treaty of Point Elliott was signed on July 17, 1855, between the United States government and 22 Native American tribes in the Washington Territory. The treaty established reservations for the tribes and promised them certain rights and privileges in exchange for ceding their land to the government.

2. On July 17, 1891, the Great Fire of Spokane broke out, destroying much of the city's central business district. The fire burned for two days, causing millions of dollars in damage and leaving thousands without homes or jobs.

3. Seattle's Century 21 Exposition, also known as the Seattle World's Fair, officially opened on July 17, 1962. The exposition brought millions of visitors to the city and introduced many new technologies and innovations, including the Space Needle and the monorail.

4. On July 17, 1975, three Ku Klux Klan members were convicted of conspiracy and civil rights violations in the murder of civil rights leader Vernon Dahmer in Hattiesburg, Mississippi. One of the members, Sam Bowers, had previously been the Imperial Wizard of the White Knights of the Ku Klux Klan.

5. The Seattle Mariners won a historic 16-inning game against the Boston Red Sox on July 17, 2000, with a walk-off home run by shortstop Carlos Guillén. The game, which lasted over five hours, set a record for the longest game in Mariners history at the time.