1. In 1860, the United States Army established Fort Mohave on April 10, located on the eastern bank of the Colorado River in Mohave County. The fort was used during the Indian Wars to protect settlers traveling along the river.

2. On April 10, 1912, Arizona became the 48th state of the United States. It was the last contiguous state to be admitted to the Union, and its flag features a copper star representing the state's mining industry.

3. In 1929, the Hoover Dam project began on April 10. The dam, located on the Colorado River between Arizona and Nevada, was completed in 1936 and is considered an engineering marvel.

4. April 10, 1994, marked the dedication of the Wrigley Mansion in Phoenix. The mansion, built in 1932 by chewing gum magnate William Wrigley Jr., is now a cultural center and event venue that offers tours and dining experiences.

5. In 2003, a large-scale wildfire known as the "Rodeo-Chediski Fire" broke out on April 10 in eastern Arizona. The fire burned over 468,000 acres and destroyed 491 buildings, making it the worst wildfire in Arizona's history at the time.