1. On July 28, 1868, the famous "Fetterman Massacre" took place near Fort Phil Kearny in Wyoming. A group of Lakota Sioux and Cheyenne warriors ambushed and killed an entire detachment of 81 soldiers and civilians under the command of Captain William J. Fetterman.

2. In 1890, the Wyoming State Legislature approved the establishment of the University of Wyoming, making it the first university in the state. Today, the University of Wyoming is a major educational and research institution with over 12,000 students.

3. On July 28, 1915, a massive explosion occurred at the Union Pacific coal mines in Rock Springs, Wyoming. The blast killed 50 miners and injured dozens more, making it one of the deadliest coal mining disasters in Wyoming history.

4. In 1923, the first Jackson Hole rodeo was held in Jackson, Wyoming. Today, the Jackson Hole Rodeo is a popular summertime event that draws thousands of visitors to the area.

5. On July 28, 1953, the legendary outlaw Butch Cassidy's sister, Lula Parker Betenson, published a book titled "Butch Cassidy, My Brother." In the book, Betenson claimed that Cassidy, whose real name was Robert LeRoy Parker, did not die in a shootout in Bolivia as some believed, but instead returned to the United States and lived out his life in secrecy. The book sparked renewed interest in the life and legacy of Butch Cassidy.