1. In 1923, the Washington State Capitol building was dedicated in Olympia. The building was constructed over a period of six years and has undergone several renovations and restorations since its dedication.

2. In 1956, a magnitude 6.5 earthquake struck the Puget Sound region, causing significant damage and several casualties. The earthquake is one of the largest to have occurred in the region in recent history.

3. In 1971, Washington State University beat the University of Oregon 34-19 in a football game held in Pullman, Washington. This win was significant as it marked the first time in 27 years that the Cougars had beaten the Ducks.

4. In 1999, the Seattle Mariners played their first game in the Kingdome since the building's ceiling tiles had been replaced. The Mariners lost the game to the Detroit Tigers, but the event marked an important milestone in the Kingdome's history.

5. In 2012, Hurricane Sandy made landfall on the East Coast, causing significant damage and widespread power outages. Although Washington was not directly affected by the storm, several local relief efforts were organized to provide aid to affected communities.