1. On July 29, 1983, the land speed record for a steam-powered vehicle was set in Arizona's Bonneville Salt Flats. The vehicle, called the "Steamliner," reached a speed of 132.843 mph.

2. On July 29, 1952, the Palo Verde Nuclear Generating Station began construction in Wintersburg, Arizona. It is the largest power plant in the United States and provides power to more than 4 million people in Arizona, California, New Mexico, and Texas.

3. On July 29, 1947, the Navajo Nation Council approved a resolution condemning the Peabody Coal Company for mining operations that disrupted traditional Navajo lifestyles and caused environmental damage to the area.

4. On July 29, 1914, the first airplane flight in Phoenix was made by Roy Knabenshue, who flew his airship over the city in front of a crowd of spectators.

5. On July 29, 1864, Prescott, Arizona was founded. It served as the capital of Arizona Territory until 1889 and was a key mining town during the late 19th century. Today, it is known for its historic downtown area and outdoor recreation opportunities.