October 17 is an important date in the history of Arizona. The state has witnessed several significant events on this day. Here are five interesting facts about October 17 in Arizona history:

1. Arizona received its state flag on October 17, 1917. The flag was designed by Colonel Charles W. Harris, who combined the colors of the sunrise and sunset to create a unique and colorful design. The copper star in the center of the flag represents the state's copper industry.

2. Phoenix's first hospital, St. Joseph's Hospital and Medical Center, was established on October 17, 1895. The hospital was founded by the Sisters of Mercy and has since become one of the state's largest hospitals.

3. Arizona's first passenger train arrived in Tucson on October 17, 1880. The train was part of the Southern Pacific Railroad and opened up new opportunities for commerce and transportation in the state.

4. The Hoover Dam, located on the border of Arizona and Nevada, was dedicated on October 17, 1935. The dam provides power and irrigation to the Southwest, and is recognized as one of the engineering wonders of the world.

5. On October 17, 1989, an earthquake with a magnitude of 7.1 struck the San Francisco Bay area, causing damage and disruption throughout the region. Although Arizona is not located along any active fault lines, the earthquake reminded residents of the importance of emergency preparedness in the event of a disaster.