1. On December 10, 1868, the first issue of the Arizona Miner, the first newspaper in the town of Prescott, was published. The newspaper played a significant role in providing the citizens of central Arizona with political and general news during the territorial period.

2. In 1913, Arizona became the 48th state to join the United States. On December 10 of that year, President Woodrow Wilson signed the statehood proclamation, formalizing Arizona's admission to the union.

3. On December 10, 1941, just three days after the surprise attack on Pearl Harbor, the Havasu Palms Indian Reservation in western Arizona was closed off to non-Indians in order to protect the Colorado River Aqueduct, which provided important irrigation for the region.

4. In 1974, artist James Turrell began constructing the Roden Crater Project, a massive observatory and art installation located near Flagstaff. Construction continues to this day, though it is not currently open to the public.

5. Finally, on December 10, 1984, the United States Department of Justice filed a lawsuit against Maricopa County, alleging racial discrimination against Hispanic inmates in the jails run by the county sheriff's office. The lawsuit would drag on for years and ultimately result in the implementation of numerous jail reforms.