1. Arizona became a state on April 1, 1912:
April 1, 1912, marked an important day in Arizona's history as it became the 48th state of the union. Independence Day in Arizona is celebrated on February 14, but the statehood day is celebrated on April 1.

2. The USS Arizona was decommissioned on April 1, 1946:
The USS Arizona, which was destroyed by the Japanese in 1941 during the attack on Pearl Harbor, was decommissioned on April 1, 1946. The ship is now a memorial site in Pearl Harbor, Hawaii.

3. Arizona State University was established on April 1, 1958:
On April 1, 1958, Arizona State University was established as a land-grant university in Tempe, Arizona. Today, ASU is one of the largest public research universities in the United States.

4. The Grand Canyon National Park was established on April 1, 1978:
On April 1, 1978, the Grand Canyon National Park in Arizona was established. The park covers over 1.2 million acres and attracts millions of visitors each year.

5. Arizona Diamondbacks played their first game on April 1, 1998:
On April 1, 1998, the Arizona Diamondbacks played their first regular-season game against the Colorado Rockies in Phoenix. The Diamondbacks won the game 9-2 and went on to win the National League Championship Series in their first year.