1. In 1892, the Johnson County War formally ended in Wyoming, with the surrender of the last group of hiding insurgents. The conflict had erupted in 1891, pitting small ranchers and settlers against powerful cattle barons and their hired gunmen.

2. On June 7, 1917, the U.S. Army established Fort Francis E. Warren near Cheyenne, Wyoming. Named after a Civil War officer and frontier commander, the fort played a key role in the defense of the western United States during the 20th century.

3. The University of Wyoming celebrated its first commencement on June 7, 1893, awarding degrees to nine graduates. Today, UW is a leading public research institution with over 12,000 students and a wide range of academic programs.

4. In 1919, the first air mail delivery in Wyoming took place on June 7, when pilot Jack Knight flew from Salt Lake City to Cheyenne in a Curtiss JN-4H airplane. This marked a major milestone in the development of airmail service across the United States.

5. On June 7, 1998, a tornado struck the town of Gillette, Wyoming, causing significant damage to several neighborhoods and injuring dozens of people. The twister was part of a larger outbreak of severe weather that affected much of the Great Plains and Midwest regions.