1. In 1911, the Roosevelt Dam was dedicated in Arizona. It was the largest masonry dam in the world at the time and helped to transform the arid desert landscape into fertile farmland.

2. In 1953, Arizona State University was formally founded. Originally known as Arizona State College, it was transformed into a university system in the 1960s and has since become one of the largest public universities in the United States.

3. On May 29, 1996, a massive wildfire known as the Lone Fire broke out in Arizona's Tonto National Forest. The fire burned for weeks and ultimately destroyed nearly 62,000 acres of land, including several homes and communities.

4. In 2002, former Arizona Governor Jane Dee Hull signed a landmark law known as the "Clean Elections Act." The law aimed to reduce the influence of money in politics by providing public funding for political campaigns, and has since become a model for other states across the United States.

5. On May 29, 2019, Arizona became the first state in the nation to recognize the Armenian Genocide. Governor Doug Ducey signed a proclamation officially recognizing the genocide, which took place during World War I and resulted in the deaths of an estimated 1.5 million Armenians.