1. Lewis and Clark's Fort Clatsop - On December 4, 1805, Lewis and Clark and the members of the Corps of Discovery began building their winter quarters at Fort Clatsop, near the mouth of the Columbia River. They spent the next few months exploring the area and making contact with the Native American tribes.

2. Pearl Harbor Attack - December 4, 1941, just three days before the Japanese attack on Pearl Harbor, a Japanese submarine fired on the American steamship SS Montebello off the coast of Oregon. The ship was carrying oil and was eventually sunk, but the crew was able to escape to safety.

3. Oregon Statehood - On December 4, 1857, Oregon officially became the 33rd state in the United States. The state is known for its natural beauty, including mountains, forests, and beaches, as well as its progressive politics and policies.

4. The Rajneesh Cult - On December 4, 1984, members of the controversial Rajneesh cult in central Oregon were indicted on federal charges of immigration fraud and violation of immigration law. The cult, which had taken over a small town in the area and engaged in contentious interactions with nearby residents, ultimately disbanded after its leader, Bhagwan Shree Rajneesh, was deported from the US.

5. Oregon's First Lady Governor - On December 4, 1909, Democrat James Withycombe was inaugurated as the Governor of Oregon, with his wife, Maude A. Withycombe, becoming the state's first lady governor. Maude was active in promoting education and health care initiatives during her husband's tenure in office.