1. On February 9, 1912, Arizona became the 48th state to join the United States of America. This day is celebrated annually as Statehood Day in Arizona.

2. In 1938, the Hoover Dam was dedicated on February 9 by President Franklin D. Roosevelt. The dam, which is located on the Arizona-Nevada border, provides hydroelectric power for millions of people and is a popular tourist attraction.

3. On February 9, 2013, a meteor exploded over the city of Chelyabinsk, Russia, injuring over 1,000 people. While this event did not occur in Arizona, it is significant because it was the largest meteor explosion in over a century and it sparked renewed interest in asteroid monitoring and detection.

4. In 2002, the Winter Olympics torch relay passed through Arizona on February 9 as part of its 65-day journey across the United States. The torch was carried by 11 individuals in Arizona, including former Olympic medalists and Native American tribal leaders.

5. On February 9, 1956, the first flight of the YF-104A aircraft took place at the Lockheed Skunk Works in Burbank, California. While this event did not occur in Arizona, the YF-104A later became a vital part of Arizona's aerospace industry and was flown by the Arizona Air National Guard for many years.