1. Arizona Statehood
On March 20, 1911, Arizona officially became the 48th state in the United States of America. This came after years of political and social battles that saw the state go through several territorial phases before achieving its statehood status.

2. Arizona Voted for Women's Suffrage
On March 20, 1914, Arizona became the ninth state in the U.S to grant women the right to vote. This was thanks to the tireless work of suffragists such as Frances Willard Munds and Pauline O’Neill who fought for women's rights in Arizona.

3. César Chávez's Birthday
March 20, 1927, marks the birthday of Cesar Chavez, a civil rights activist and labor leader born in Yuma, Arizona. Chavez used non-violent methods to protest the poor working conditions that farm laborers were facing in California and other parts of the U.S.

4. A Solar Eclipse
On March 20, 2015, a total solar eclipse occurred in the northern hemisphere, including Arizona. This rare astronomical event occurs when the Moon passes directly between the Sun and Earth, causing the Sun’s light to be blocked out for a short time.

5. Baseball Spring Training
March 20 marks the official start of the Major League Baseball's spring training season in Arizona. This event attracts thousands of fans from across the country who come to watch their favorite teams as they gear up for the regular season. Many teams use Arizona's natural and scenic beauty to train in outdoor stadiums around the state.