1. On December 13, 1913, the Phoenix Union High School Association was established. The association was formed to oversee the management and operation of the first high school in Phoenix, Arizona, which had just been constructed.

2. In 1933, on December 13, the United States government officially recognized the Navajo Nation as a sovereign nation. The recognition was a significant achievement for the Navajo Nation, which had been fighting for recognition and autonomy for decades.

3. On December 13, 1941, during World War II, Japanese-American citizens living in the Phoenix area were ordered to report to a local internment camp. The order was part of President Franklin D. Roosevelt's Executive Order 9066, which authorized the internment of Japanese-Americans following the attack on Pearl Harbor.

4. On December 13, 1969, the Arizona Board of Regents approved the establishment of a new university in northern Arizona. The university, which became known as Northern Arizona University, opened its doors in 1971 and has since grown to become one of the state's largest universities.

5. In 2002, on December 13, a shooting occurred at the Miccosukee Resort and Gaming casino near Phoenix. One person was killed and several others injured in the incident, which was reportedly sparked by a dispute over a bet at a blackjack table. The shooter, identified as 56-year-old Jose Garcia Martinez, was later arrested and charged with first-degree murder.