1. In 1917, the Flagstaff chapter of the Daughters of the American Revolution was founded on June 18th. The organization is dedicated to preserving American history and promoting patriotism.

2. June 18, 1915, marked the completion of the Tonto Forest Road in Arizona. The road was critical for accessing the Tonto National Forest, which is now the fifth-largest national forest in the United States.

3. On June 18th, 1931, the historic Sotomayor House in Tucson, Arizona, was added to the National Register of Historic Places. The house was built in 1902 and belonged to the prominent Sotomayor family.

4. In 1941, Scottsdale, Arizona, was incorporated as a city on June 18th. Today, Scottsdale is a popular destination for tourists and is known for its luxury resorts and spas.

5. June 18th, 1980, marked the tragic day of the Miracle Flight 232 crash in Sioux City, Iowa, but an Arizona native, Dudley Dvorak, was among the heroic flight crew who saved 185 of the 296 passengers and crew members. Dvorak was a veteran of both the Vietnam War and the U.S. Air Force, and he later went on to teach at Embry-Riddle Aeronautical University in Prescott, Arizona.

Overall, June 18 has been a significant date in Arizona history, with important events ranging from the founding of organizations to the tragedy and heroism of the Miracle Flight 232 crash.