1. On September 1, 1887, the Phoenix Street Railway began service, utilizing horse-drawn streetcars to transport passengers across the city. This marked an important milestone in transportation infrastructure in Arizona.

2. On September 1, 1916, a group of 50 Apache fighters attacked the town of Oracle, Arizona, in what would come to be known as the Battle of Oracle. Though the town sustained significant damage, the Apache ultimately retreated and the town was able to rebuild.

3. September 1, 1929, was a significant day for the Arizona State Highway Department, as it marked the official opening of the Laurel Canyon Highway, which connected Phoenix to the Detroit-Wenden Highway.

4. On September 1, 1947, the United States Air Force announced that Williams Air Force Base in Chandler, Arizona, would become a training center for fighter pilots. This marked the beginning of a long and important role that the Air Force has played in the state's history.

5. September 1, 1983, was a significant day for the University of Arizona, as it marked the inauguration of Robert C. Robbins as its 22nd president. Robbins, who came from Stanford University, would go on to oversee significant growth and expansion for the university in the following years.