1. Statehood: On March 20, 1859, Oregon officially became a state, making it the 33rd in the United States. Prior to this, Oregon was a territory of the US.

2. Wildlife Protection: In 1933, the Oregon Department of Fish and Wildlife was created. This department is responsible for the management and protection of all fish, wildlife and habitat in the state of Oregon.

3. Environmental Protection: March 20, 1971, the Oregon Bottle Bill was passed, which made Oregon the first state in the United States to implement a bottle bill. The bill imposed a deposit on certain beverage containers, encouraging residents to reduce waste and recycle.

4. Transportation: On March 20, 1888, the first bridge over the Willamette River was opened to the public in Oregon. The bridge was built to connect Portland to East Portland and became known as the Morrison Bridge.

5. Historical Landmark: On March 20, 1972, the John McLoughlin House in Oregon City was designated as a National Historic Landmark. John McLoughlin was a prominent figure in the early history of Oregon and the house served as his residence and also as the headquarters for the Hudson's Bay Company in the region.