1. In 1892, the Washington Athletic Club was established in Seattle. The club was one of the oldest and most prestigious athletic clubs in the Pacific Northwest which catered to the wealthy businessmen of the city.

2. In 1915, the Seattle Times sponsored the first "Seafair" event, a summer festival that celebrates the culture and history of the Pacific Northwest. The festival has become one of the largest summer celebrations in the United States.

3. In 1934, the Olympic National Park was established in Washington. The park is home to a diverse range of ecosystems, including temperate rainforests, alpine meadows, and stunning coastal vistas, making it a popular destination for outdoor enthusiasts.

4. In 1949, the Grand Coulee Dam was completed, becoming the largest hydroelectric power-generating facility in the United States. The dam is a marvel of engineering and helped to bring electricity to much of the Pacific Northwest.

5. In 1980, the eruption of Mount St. Helens, located in Skamania County, Washington, devastated the surrounding area, causing widespread damage and the loss of 57 lives. The eruption was one of the most significant volcanic events in the history of the United States.