1. On April 19, 1924, the Arizona state flag was officially adopted. The design of the flag was created by Colonel Charles W. Harris, who was the head of the Arizona National Guard at the time.

2. On April 19, 1930, the Hoover Dam was officially dedicated by President Herbert Hoover. The dam, located on the Arizona/Nevada border, is a major source of hydroelectric power in the western United States.

3. On April 19, 1982, the Arizona Diamondbacks played their first game as a Major League Baseball team. The Diamondbacks defeated the Colorado Rockies 3-2 in their inaugural game at Chase Field in Phoenix.

4. On April 19, 2005, the Phoenix Suns set an NBA record by making 22 three-pointers in a single game. The Suns defeated the Memphis Grizzlies 127-102, led by Steve Nash's 31-point performance.

5. On April 19, 2015, the Phoenix Mercury retired the jersey of basketball legend Diana Taurasi. Taurasi is widely considered one of the greatest players in WNBA history, having won three championships and numerous individual awards during her career with the Mercury.