As a language AI model, I suggest some of the following interesting facts about December 1 in Washington history:

1. In 1824, the city of Washington, D.C. was lit with gas lights for the first time. It was a significant event that marked the city's progress towards modernization, and served as a precedent for other cities across the nation.

2. On December 1, 1862, President Abraham Lincoln submitted his annual message to Congress. In this message, he introduced the Emancipation Proclamation, which declared all slaves in the Confederate states "forever free" as of January 1, 1863.

3. In 1933, the 21st Amendment to the U.S. Constitution was ratified, ending Prohibition and allowing the sale and manufacture of alcohol again. This was a significant event in Washington, D.C. as well, as the city had been one of the first to enact Prohibition in 1918.

4. On December 1, 1955, Rosa Parks was arrested in Montgomery, Alabama for refusing to give up her seat on a bus to a white passenger. Her act of resistance sparked the Montgomery Bus Boycott, which served as a catalyst for the Civil Rights Movement.

5. In 1993, the North American Free Trade Agreement (NAFTA) was signed into law by President Bill Clinton. The agreement, which aimed to promote free trade between the U.S., Canada, and Mexico, had significant impacts on Washington state's economy, particularly in the agricultural and manufacturing sectors.