1. In 1859, Oregon was admitted as the 33rd state in the union. This was a significant moment in Oregon history, as it marked the end of a long struggle for statehood that had begun in the early 1840s.

2. In 1905, the Lewis and Clark Centennial Exposition opened in Portland. The exposition was held to celebrate the 100th anniversary of the Lewis and Clark Expedition, which had explored the Pacific Northwest in 1804-1806.

3. In 1963, a major earthquake struck Coos Bay on the Oregon coast. The earthquake had a magnitude of 8.5, making it the largest earthquake ever recorded in Oregon. Although there was significant damage in the area, there were no fatalities.

4. In 1971, the Oregon Bottle Bill was signed into law. This legislation made Oregon the first state in the nation to require a deposit on beverage containers, with the aim of reducing litter and encouraging recycling.

5. In 1980, the Mount St. Helens eruption occurred in Washington state, just north of the Oregon border. The eruption was one of the most significant volcanic events in U.S. history and had a significant impact on the surrounding region, including several counties in Oregon. The eruption was also responsible for the deaths of 57 people.