1. In 1882, the first train arrived in the town of Flagstaff, Arizona. This event marked a significant milestone in the growth and development of Flagstaff as a major transportation hub in Northern Arizona.

2. On September 4, 1912, construction began on the Roosevelt Dam, which is located in Tonto National Forest. The construction of the dam took several years to complete and helped to provide a reliable source of water for the surrounding communities.

3. In 1978, Arizona Governor Wesley Bolin died on September 4th. Bolin was Arizona's longest-serving governor, having held the position for a total of 16 years.

4. On September 4th, 1998, the town of Prescott dedicated a statue of legendary cowboy and actor, Tom Mix. The statue was created to commemorate Mix's contributions to the town and to honor his legacy as one of Hollywood's most famous cowboys.

5. In 2009, a wildfire known as the "La Barge Fire" broke out near the town of Payson, Arizona. The fire burned for several days before it was finally contained, and it caused significant damage to the surrounding areas. The cause of the fire was determined to be human-caused, and it served as a reminder of the importance of wildfire prevention and fire safety in Arizona.