1. On December 29, 1853, the Washington Territory was established:
December 29 marked an important day in the state of Washington's history as it was the day the Washington Territory was established. It was created out of the northern portion of Oregon Territory and included the areas that make up the modern-day state of Washington, as well as parts of Montana and Idaho.

2. The Great Seattle Fire occurred on December 29, 1889:
One of the most disastrous events in Seattle's history was the Great Seattle Fire, which occurred on December 29, 1889. The fire started at the Klondike Gold Rush boomtown and destroyed more than 60 blocks of downtown Seattle.

3. The Port of Seattle was officially created on December 29, 1911:
The Port of Seattle, one of the busiest and most significant ports in the United States, was officially created on December 29, 1911. It was a major economic milestone for the Pacific Northwest as it allowed for increased trade and commerce between Asia and the United States.

4. The 2004 Indian Ocean tsunami affected Washington state on December 29, 2004:
The 2004 Indian Ocean tsunami is one of the deadliest natural disasters in modern history. Although Washington state was not directly affected by the tsunami, several state residents lost their lives while on vacation in Southeast Asia.

5. Washington state was the first to legalize recreational marijuana on December 29, 2012:
On December 29, 2012, Washington became the first state in the United States to legalize recreational marijuana. This move was seen as a major milestone in the history of the drug reform movement. The first retail stores were opened on July 8, 2014.