1. In 1829, Mexican explorer Antonio Armijo became the first person to travel from New Mexico to California via a route that went through Arizona on September 22.

2. On September 22, 1905, the Salt River Project was created to help provide irrigation water and electricity to central Arizona's Salt River Valley, helping to fuel the region's growth and development.

3. In 1923, legendary Arizona Senator Carl Hayden introduced the Colorado River Compact Act in Congress on September 22, which helped to establish how water from the Colorado River would be allocated among various states in the region.

4. On September 22, 1982, Arizona Governor Bruce Babbitt signed a law that established Martin Luther King Jr. Day as a state holiday, making Arizona one of the first states in the nation to officially recognize the civil rights leader's contributions.

5. In 2010, the Grand Canyon National Park celebrated its 100th anniversary on September 22, marking a century since President Theodore Roosevelt officially designated the area as a national monument. Today, the park welcomes millions of visitors each year and remains one of Arizona's most iconic natural landmarks.