1. Mt. St. Helens erupted on May 18, 1980, causing immense destruction in Washington state and killing 57 people. The eruption was one of the most significant volcanic events in American history, resulting in widespread damage to the landscape and altering the surrounding ecosystem for decades afterwards.

2. On May 18, 1993, President Bill Clinton visited the Yakama Indian Reservation in Toppenish, Washington. During his visit, Clinton spoke with members of the Yakama Nation about issues related to Native American sovereignty and self-determination.

3. On May 18, 1930, the Bonneville Dam was dedicated by President Herbert Hoover. The dam, which spans the Columbia River between Oregon and Washington, was a major engineering feat of its time and helped to provide electricity and water for the Pacific Northwest for decades to come.

4. On May 18, 1962, baseball legend Stan Musial hit his 3,431st career hit, tying him with Tris Speaker for second on the all-time hit list. Musial, who played for the St. Louis Cardinals for his entire career, finished his career with 3,630 hits, third all-time behind only Pete Rose and Ty Cobb.

5. On May 18, 1910, the Pacific Northwest experienced one of the most severe wildfires in American history. The wildfire, which is now known as the "Big Burn," burned over 3 million acres in Washington, Idaho, and Montana, and resulted in the deaths of 87 people, including firefighters who were attempting to contain the blaze.