1. Birth of Yavapai County: On August 1, 1864, Yavapai County was officially formed, dividing the former Yavapai County into two separate territories. With its county seat in Prescott, Yavapai County played a vital role in the development of Arizona as a territory and later, a state.

2. Tragedy at the Glen Canyon Dam: On August 1, 1983, a fatal accident occurred at the Glen Canyon Dam in Page, Arizona. A high-pressure water valve ruptured, causing a massive explosion that killed three workers and injured several others. The dam was closed for repairs for over a year following the incident.

3. Establishment of the Grand Canyon National Park: August 1, 1919 marked the creation of Grand Canyon National Park. Located in northern Arizona, the park attracts millions of visitors each year and is known for its stunning geological features and breathtaking views.

4. Arizona Statehood Day: August 1, 1911 was a significant day in Arizona history as it marked the day that Arizona officially became the 48th state. The day is celebrated as Arizona Statehood Day and is recognized as a state holiday.

5. Introduction of the Arizona Diamondbacks: August 1, 1998 saw the introduction of the Arizona Diamondbacks, the state's Major League Baseball team. The team has since won five National League Western Division titles and one World Series championship in 2001.