1. On December 10, 1868, the United States Army launched an attack on the Cheyenne and Arapaho tribes in what is now western Oklahoma. The resulting Battle of Washita River was a decisive victory for the army and marked a major turning point in the Indian Wars.

2. In 1890, the University of Wyoming was officially established on December 10th, becoming the first accredited university in the state. The university has since grown to become a major research institution and one of the top public universities in the region.

3. December 10, 1913, saw the birth of Wyoming native Alvin Wiederspahn, who would go on to become a prominent state politician and serve in the Wyoming House of Representatives from 1959 to 1965. He was also a key figure in the development of Wyoming's coal industry.

4. December 10, 1971, marks the day when the Grand Teton Music Festival was first launched in Jackson Hole, Wyoming. The festival has since become a major cultural event in the region, attracting top performers from around the world and showcasing a wide range of musical styles.

5. December 10, 1986, saw the establishment of the Watchable Wildlife Program in Wyoming, with the goal of promoting the viewing and appreciation of the state's diverse wildlife. Today, the program has grown to include a network of viewing sites and educational programs, helping visitors to better understand and appreciate Wyoming's natural beauty.