1. Construction of the Hoover Dam began on November 20, 1930. This iconic structure spans the Arizona-Nevada border and provides hydroelectric power to both states, in addition to controlling water flow in the region.

2. November 20, 1985 marks the occasion when Arizona Governor Bruce Babbitt announced the first ever state lottery. The game was named "The Pick" and has since raised millions of dollars for education and other public initiatives.

3. On November 20, 1917, a group of Apache warriors led by Geronimo surrendered to U.S. authorities at Fort Sill, Oklahoma. Geronimo had been a prominent leader in the Apache Wars, which took place in Arizona and other parts of the Southwest during the late 1800s.

4. In November 20, 2001, the Arizona Diamondbacks won the World Series, defeating the New York Yankees in a thrilling 7-game series. The team had only been in existence for four years at the time, making it one of the quickest World Series victories for a new franchise.

5. On November 20, 1864, a group of volunteers from Arizona Territory joined Union forces in the Battle of Picacho Peak - the westernmost engagement of the Civil War. Though the battle was brief and ultimately inconclusive, it remains a significant moment in Arizona's military history.