1. In 1826, American explorer Jedediah Smith became the first non-Native American to travel through the Colorado Plateau region of Arizona. Smith's journey helped set the stage for further exploration of the territory.

2. On September 26, 1867, the United States Army established Fort Apache in eastern Arizona. The fort was built to protect settlers from Apache raids, and it served as the headquarters for the U.S. military's various campaigns against the Apache over the years.

3. In 1910, the city of Phoenix was incorporated as a city. The city, which had been founded in 1868 as a farming community, had grown rapidly in the decades leading up to the incorporation, thanks in part to the arrival of the railroad in 1887.

4. In 1933, the "Globe-Miami strike" began in eastern Arizona. The strike, which involved copper miners demanding better pay and improved working conditions, lasted for several months and resulted in violence when the mining companies brought in non-union workers to break the strike.

5. On September 26, 1960, the first presidential debate of the 1960 election took place at the studios of CBS in Chicago. The debate between John F. Kennedy and Richard Nixon was watched by millions of Americans, and is often cited as the moment when television began to play a major role in American politics.