1. In 1850, the first steamship to navigate the Columbia River, the "Columbia," arrived at Portland, Oregon. This opened up trade opportunities for the state as the river became a major transportation route.

2. On September 28, 1918, the first case of Spanish Flu was reported in Oregon, marking the beginning of a devastating pandemic that would last for two years.

3. In 1962, a group of Native American activists from Oregon and Washington organized the "Fish-In" protest on the banks of the Columbia River. The protest was aimed at securing traditional fishing rights that had been denied to Native American tribes for decades.

4. On September 28, 1971, the Oregon State Capitol building was added to the National Register of Historic Places. The building, located in Salem, Oregon, was completed in 1938 and is known for its unique Art Deco architecture.

5. In 2013, Oregon became the 18th state to legalize same-sex marriage. The state's ban on same-sex marriage was overturned by a federal judge on September 28, 2013, paving the way for hundreds of same-sex couples to get married in the state.