1) December 7, 1889, marked the day that Washington officially became the 42nd state in the United States. The statehood ceremony took place in Olympia and a parade was held to celebrate the occasion.

2) In 1941, the attack on Pearl Harbor occurred on December 7, leading the United States to enter World War II. Washington state played a significant role in the war effort, from the shipbuilding industry in Seattle to serving as the site of military installations and training camps.

3) On December 7, 2007, the Seattle Seahawks of the National Football League made history by becoming the first and only team in NFL history to make the playoffs with a losing record. They finished the season with a record of 7-9 and won the NFC West division title.

4) The deadly 2007 Western Washington windstorm, also known as the Hanukkah Eve windstorm, struck on December 7 and caused widespread power outages and property damage. The storm was one of the worst in the region's history.

5) December 7, 2018, was marked as Seattle's first official Indigenous Peoples' Day, replacing Columbus Day. The decision was made to recognize and honor the contributions and cultures of the city's Native American community.