1. On April 16, 1862, the first stagecoach arrived in Tucson from California, marking the beginning of regular stagecoach service between the two states.

2. In 1912, on April 16, the Arizona State Capitol building was dedicated in Phoenix. The building, designed by architect James Riely Gordon, features a copper dome and is listed on the National Register of Historic Places.

3. On April 16, 1965, the Phoenix Suns played their first game as a National Basketball Association (NBA) team, losing to the Detroit Pistons 114-107. The Suns would go on to become a successful franchise, reaching the NBA Finals multiple times.

4. In 1974, on April 16, Arizona Governor Jack Williams signed a law designating the bola tie as the official state neckwear. The bola tie, a piece of Western-style jewelry made of braided leather or cords with metal tips, is often associated with Arizona and the American Southwest.

5. On April 16, 2004, the Navajo Nation announced the creation of the Diné Marriage Act, which recognized same-sex marriages performed under tribal law. The Navajo Nation was one of the first Native American tribes to extend marriage rights to same-sex couples.