1. In 1915, the Arizona Rangers, a law enforcement agency formed in the late 1800s, were disbanded due to accusations of corruption and brutality.

2. On January 12, 1918, the Grand Canyon was designated as a national park, protecting the area from further development and ensuring its preservation for future generations.

3. In 1933, Arizona's state legislature ratified the 21st Amendment to the U.S. Constitution, which repealed Prohibition and allowed for the sale and consumption of alcoholic beverages.

4. On January 12, 1959, Arizona became the last state in the contiguous United States to be admitted to the Union, marking the end of a 50-year campaign for statehood.

5. In 2011, Arizona Congresswoman Gabrielle Giffords was critically injured in a mass shooting at a Tucson event where she was meeting with constituents. Six people were killed in the attack, and Giffords went on to become a vocal advocate for gun control measures.