1. On December 20, 1909, Wyoming officially became the 45th state in the United States. It is also known as the "Equality State" because it was the first state to grant women the right to vote in 1869.

2. In 1946, the University of Wyoming defeated the heavily favored North Texas State Eagles to win the first-ever Sun Bowl championship on December 20. The final score was 20-7, and it is considered one of the most significant victories in the school's history.

3. On December 20, 1963, President Lyndon B. Johnson signed the "Wyoming Wilderness Act," which designated several areas within the state as federally protected wilderness. The act aimed to preserve natural areas, promote outdoor recreation, and protect wildlife habitats.

4. In 1986, one of the deadliest airplane crashes in Wyoming history occurred on December 20. A Continental Airlines flight crashed into a mountain near Jackson Hole, killing all 27 passengers and crew on board. The incident led to improved safety measures and increased training for pilots operating in mountainous regions.

5. On December 20, 2004, a massive snowstorm hit Wyoming, causing widespread power outages and highway closures. The storm dumped over two feet of snow in some areas and was responsible for several accidents and fatalities. The storm was later dubbed the "Wyoming Blizzard of 2004."