1. In 1867, the first regular mail service to Arizona Territory began on June 25.

2. On June 25, 1909, the first airplane flight in Arizona took place in Phoenix. Orville and Wilbur Wright's exhibition lasted for only a few minutes but marked the beginning of aviation in Arizona.

3. In 1910, the first Chiricahua National Monument was established on June 25. The park was created to protect the rock formations and rare plants found in the area.

4. Arizona State Route 51, also known as the Piestewa Freeway, opened on June 25, 1991. The freeway connects Phoenix and Scottsdale and was named in honor of Army Spc. Lori Ann Piestewa, the first Native American woman to die in combat while serving in the U.S. military.

5. In 2013, the Yarnell Hill Fire broke out on June 25 and took the lives of 19 firefighters from the Granite Mountain Hotshots. The tragic event marked the deadliest wildfire in the state's history.