1. On July 19, 1879, Arizona's first telephone line was established in Tucson. The line was a direct connection between the office of the Arizona Daily Citizen newspaper and the telegraph office of the Southern Pacific Railroad.

2. In 1912, on July 19, Arizona was admitted as the 48th state of the United States. The decision came after Congress recognized the territory as a state according to the conditions of the Enabling Act.

3. On July 19, 1960, the world's first solar-powered radio telescope was dedicated in Green Bank, West Virginia, with a supporting team from the Kitt Peak National Observatory in Arizona. The telescope was an important innovation in the field of radio astronomy.

4. On July 19, 2018, a haboob swept through Phoenix, Arizona, reducing visibility to near-zero and causing power outages across the city. The dust storm was the result of thunderstorm activity in the surrounding desert.

5. In 1989, on July 19, Arizona Governor Evan Mecham was impeached and removed from office. Mecham was accused of misconduct and obstruction of justice related to an investigation into his campaign finances. He was the first governor in U.S. history to be impeached and removed from office.