1. On December 6, 1889, Washington State was admitted to the Union as the 42nd state. The journey to statehood was a long and difficult one, with the territory facing challenges such as hostile Native American tribes, harsh weather, and a lack of infrastructure.

2. In 1983, a major earthquake struck the city of Pasco on December 6, causing widespread damage and injuring dozens of people. Known as the Klickitat earthquake, it measured 5.7 on the Richter scale and was felt throughout the state.

3. December 6, 1957 marked the opening of the first cross-state highway in Washington, the White Pass Scenic Byway. Spanning 143 miles across the scenic Cascade Mountains, the highway offers breathtaking panoramic views of the area's natural beauty.

4. On December 6, 1917, a massive explosion occurred in the harbor of Tacoma, Washington, when a munitions ship caught fire and exploded. The blast rocked the city, causing extensive damage and killing several people. The disaster led to improved safety measures in the handling of hazardous materials.

5. December 6, 1975 saw the opening of the Museum of Flight in Seattle, one of the largest air and space museums in the world. The museum features a vast collection of aircraft, space vehicles, and artifacts related to aviation history, and is a popular tourist destination in the state.