1. In 1926, the Grand Canyon was declared a national monument by President Calvin Coolidge. This was a significant moment in Arizona's history as the Grand Canyon is now one of the state's most popular tourist destinations.

2. Across the state, December 8th has become known as "Pearl Harbor Remembrance Day," as this was the date of the infamous attack on Pearl Harbor that led to America's entry into World War II. Arizona played a crucial role in the war, with several military bases located throughout the state.

3. In 1963, Arizona officially adopted its state flag. The design features a copper star representing the state's copper industry, as well as a field of blue to represent the Colorado River and the state's sunny skies.

4. December 8th, 1980, marks the day that former Beatle John Lennon was tragically murdered in New York City. Though Lennon never lived in Arizona or had any particular connection to the state, his music had a profound impact on generations and his death was felt around the world.

5. Another important moment in Arizona's history occurred on December 8th, 1929, when the Hoover Dam began operations. Located on the border between Arizona and Nevada, the dam is one of the largest and most impressive engineering feats in American history, and it brought many jobs and economic benefits to the Arizona region.