1. In 1946, the Tacoma Narrows Bridge in Washington began to sway and ultimately collapse in what became known as the "Galloping Gertie" disaster. The bridge's collapse was due to resonance caused by strong winds, leading to its destruction and the deaths of several people.

2. In 1888, the famous Washington philanthropist and businessman Andrew Carnegie funded the construction of the first public library in Washington, located in the city of Seattle. The library was built to provide free and accessible education to the people of Washington, and it still remains open to the public today.

3. On April 3, 1984, the Washington State Supreme Court issued a landmark ruling in the case of State v. Gunwall, which established a new standard for evaluating the state constitution's protection of individual rights that was later adopted by other state courts across the country.

4. In 1913, the Washington State Legislature passed the first workers' compensation law in the United States, providing financial support to workers who were injured on the job. The law helped to protect workers and their families from the financial burden of workplace injuries and contributed to the development of the modern workers' compensation system.

5. On April 3, 2005, the Seattle Seahawks' new stadium – CenturyLink Field – opened to the public. The stadium's construction was a significant event in the city's history and helped to revitalize Seattle's downtown area. Today, CenturyLink Field hosts some of the most popular sporting events in Washington, including Seattle Seahawks football games and Seattle Sounders soccer matches.