1. On July 23, 1975, the Seattle Mariners played their first game. The game was against the Oakland Athletics, and the Mariners lost 6-0.

2. On July 23, 1906, the city of Spokane hosted the first national logging competition. This competition was a centerpiece of the annual Spokane Interstate Fair and was attended by loggers from all over the country.

3. On July 23, 1948, the Seattle Center Monorail opened to the public. The monorail was built for the 1962 Seattle World's Fair and is still in operation today.

4. On July 23, 1927, the Seattle Municipal Airport (now known as Boeing Field) opened to the public. The airport was built by Boeing to test its airplanes, and it quickly became a hub for general aviation in the Pacific Northwest.

5. On July 23, 1974, the state of Washington became the first state to ban sex discrimination in credit transactions. With this law, banks and other lenders could no longer discriminate against women when granting credit.