1. In 1864, Oregon's first newspaper The Weekly Oregonian published its first issue on May 5th. The newspaper, now known as The Oregonian, is still in circulation and is the state's largest newspaper.

2. On May 5th, 1933, the construction of the Timberline Lodge on Mount Hood was completed. Built as a Works Progress Administration (WPA) project during the Great Depression, the lodge has become an iconic symbol of Oregon and is still in operation today.

3. In 1980, on May 5th, the eruption of Mount St. Helens occurred. The volcanic eruption was the deadliest and most economically destructive volcanic event in U.S. history. It caused widespread devastation, including the loss of 57 lives and the destruction of hundreds of homes and buildings.

4. In 1983, on May 5th, the Portland Trail Blazers won their first NBA playoff series in franchise history. Led by star players Clyde Drexler and Terry Porter, the Blazers went on to make it all the way to the NBA Finals that year, ultimately losing to the Philadelphia 76ers.

5. On May 5th, 2015, the Oregon State Legislature passed a bill legalizing recreational marijuana, making Oregon the third state in the U.S. to do so. The law allowed adults over the age of 21 to possess and use marijuana and also established a regulatory framework for its cultivation and sale.