1. On March 1, 1862, the first major engagement of the American Civil War fought in the western United States occurred in Arizona at the Battle of Picacho Pass.

2. March 1, 1872, marks the founding of the city of Tucson, Arizona, which became the first incorporated city in the state.

3. On March 1, 1912, Arizona became the 48th state to join the United States, and the last of the contiguous states to be admitted into the Union.

4. March 1, 1933, was the day that the construction of the Hoover Dam officially began on the Arizona-Nevada border.

5. In March 1, 1975, Arizona's state flag was adopted by the Arizona legislature, featuring a copper-colored star in the center representing the state's copper industry and the 13 rays of red and gold symbolizing the original 13 colonies of the United States.