1. On December 16, 1858, Arizona resident and entrepreneur Martha Summerhayes was born in England. Known for her memoir "Vanished Arizona," which chronicled her experiences in the Arizona Territory in the late 1800s, Summerhayes became an important figure in the history of Arizona.

2. In 1943, the United States government established the Gila River Internment Camp near Sacaton, Arizona. The camp held thousands of Japanese American citizens who were forcibly removed from their homes and businesses on the West Coast during World War II. December 16 marked the arrival of the first group of detainees at the camp.

3. On December 16, 1918, the Grand Canyon National Park was officially established by Congress. The park, located in northwestern Arizona, encompasses over a million acres of land and is home to one of the most iconic natural wonders in the world.

4. In 1960, the city of Phoenix experienced one of the largest snowstorms in its history on December 16. Over six inches of snow fell in some areas, causing widespread disruption and forcing the closure of schools and businesses.

5. On December 16, 1909, Arizona Governor Richard E. Sloan signed the Bill of Rights for Women into law, granting women the right to vote in Arizona. Arizona was the tenth state in the U.S. to grant women suffrage.