1. In 1846, the Oregon Treaty was signed, officially ending a territorial dispute between the United States and Great Britain over the Oregon Country. This treaty established the 49th parallel as the border between British and American territories, setting the foundation for the future state of Oregon.

2. On June 28, 1917, the first woman elected as mayor in Oregon took office. Georgia McMillan was elected to serve as mayor of Umatilla, a small city in northeast Oregon. She was a suffragette and activist and used her position to champion women's rights and social welfare programs.

3. In 1928, the first gas station in the world with an automatic car wash opened in Portland, Oregon. The facility was designed by entrepreneur Frank Usher and featured a conveyor system that moved cars through a series of stations for cleaning and drying.

4. On June 28, 1971, the Oregon state legislature passed the landmark Bottle Bill. This law required a refundable deposit on all beer and soda containers sold in the state, in an effort to reduce litter and increase recycling. Oregon was the first state in the country to implement such a law, and it has since become a model for other states.

5. In 1982, the world's first commercial wind farm began operation in Oregon's Columbia River Gorge. The wind farm was built by a company called Kenetech, and featured 20 wind turbines that generated enough electricity to power roughly 3,000 homes. Today, the Columbia River Gorge remains a hub for wind power generation, with dozens of wind farms dotting the landscape.