1. Arizona became a state: On July 30, 1912, President William Howard Taft signed the proclamation making Arizona the 48th state in the United States.

2. Hoover Dam construction began: On July 30, 1930, construction began on the Hoover Dam, a marvel of engineering that was built on the Colorado River between Arizona and Nevada.

3. Arizona's hottest day on record: On July 30, 2003, the town of Lake Havasu City recorded the highest temperature ever in Arizona history at 128 degrees Fahrenheit.

4. Tragedy strikes at Phoenix hospital: On July 30, 2003, the Phoenix Veterans Affairs Medical Center experienced a power outage during a heat wave, which caused the deaths of 3 patients.

5. Historic building listed on National Register: On July 30, 1974, the Fox Theater in Tucson, Arizona was listed on the National Register of Historic Places for its unique art deco style and cultural significance in the community.