1. On March 12, 1912, Arizona officially became the 48th state to enter the Union, becoming the last of the contiguous states to be admitted.

2. In 1930, a 7.3 magnitude earthquake struck the town of Meadview, located in northwestern Arizona. The quake caused significant damage to houses and buildings in the area, but no fatalities were reported.

3. The Arizona State Board of Education was established on March 12, 1910, with the goal of providing educational leadership and advocating for public education in the state.

4. In 1895, a group of settlers in the Phoenix area formed the Salt River Valley Water Users’ Association to manage the land’s scarce water resources. This organization helped divert water from the Salt River to irrigate crops, fueling the growth of the state’s agriculture industry.

5. On March 12, 1989, a massive dust storm swept through Phoenix, reducing visibility to near-zero and causing widespread power outages. The event, which became known as the "Brown Cloud," prompted many residents to reconsider the city's unchecked growth and demands on natural resources.