1. On December 19, 1914, the Santa Fe Railway's new branch line to Guaymas, Mexico was completed. This new transportation route opened up trade opportunities for Arizona businesses in Mexico.

2. The Arizona Republic newspaper began publishing on December 19, 1890. The paper has become one of the most influential newspapers in Arizona history, covering major events and stories throughout the state.

3. On December 19, 1958, a major dust storm hit Phoenix, causing chaos and destruction throughout the city. The storm was one of the worst in Arizona history, and prompted government officials to take action to improve air quality in the state.

4. Arizona's first commercial solar power plant began operations on December 19, 2014, in Gila Bend. The Solana Generating Station, operated by Arizona Public Service, was the largest parabolic trough solar plant in the world at the time.

5. The town of Superior, Arizona, celebrates "Miracle on Main Street" on December 19 each year, in honor of a Christmas miracle that occurred in the town in 1950. A group of miners who had been trapped underground for over two weeks were rescued just in time for Christmas, thanks to the efforts of rescue workers and the entire community.