1. In 1819, the first trading post in Wyoming was established by the American Fur Company at Fontenelle's Post on the Green River. It served as a vital trading hub for trappers and Native Americans until its abandonment in 1840.

2. On May 23, 1868, Wyoming Territory was established by an act of Congress. The territory was formed from parts of the Dakota, Utah, and Idaho territories, and included the modern-day states of Wyoming, Montana, and Idaho.

3. In 1923, the University of Wyoming dedicated its new Memorial Hall to honor the students and alumni who had served in World War I. The hall's interior features elaborate murals and stained glass windows depicting Wyoming's history and culture.

4. On May 23, 1934, the infamous bank robber and outlaw, Bonnie Parker of the infamous Bonnie and Clyde duo, was killed in a police ambush near Sailes, Louisiana. Parker and Clyde Barrow had committed several robberies in Wyoming and other states during their short but violent crime spree.

5. In 1962, the world's first commercial uranium mill began operations near Jeffrey City, Wyoming. The mill processed uranium ore from nearby mines for use in nuclear power plants and weapons. The boom in uranium production brought economic growth to the region, but also raised concerns about environmental contamination and worker safety.