1. In 1935, the Hoover Dam was completed and officially turned over to the federal government. The dam, which straddles the border of Nevada and Arizona, was built over five years and has since become a major source of hydroelectric power for the region.

2. On May 25, 1942, the Royal Canadian Air Force mistakenly bombed the city of Estevan, Washington during a training exercise. This incident sparked outrage among locals and led to increased safety measures to prevent similar accidents in the future.

3. In 1979, a major volcanic eruption occurred at Mount St. Helens in southwestern Washington. The eruption sent ash and debris into the air, causing widespread devastation and killing 57 people.

4. On May 25, 1987, the Hiram M. Chittenden Locks in Seattle were officially designated as a National Historic Site. The locks, which were completed in 1917, allow boats to pass between Lake Washington and Puget Sound.

5. In 2018, Washington became the first state in the U.S. to pass a law protecting net neutrality. The law prohibited internet service providers from blocking or slowing down access to certain websites and helped to set the stage for similar legislation in other states.