1. May 1, 1913, marks the establishment of the first state park in Arizona, the Grand Canyon State Park. The park covers over one million acres and attracts millions of visitors every year.

2. May 1, 1938, is the day when Tonto National Forest was established in Arizona. The forest is the fifth-largest national forest in the United States, spanning across nearly three million acres.

3. Arizona officially became the 48th state of the United States on February 14, 1912, but May 1, 1912, marks the day when the new state government officially began its operations.

4. On May 1, 1967, the city of Phoenix enacted the first municipal equal opportunity ordinance in the United States. The law prohibited discrimination based on race, gender, religion, and national origin in employment, housing, and public accommodations.

5. May 1, 1999, is a significant day for the Grand Canyon State in terms of education, as it marks the opening of the first charter school in Arizona. The charter school movement has rapidly grown in the state and has provided an alternative option for students and parents seeking alternative educational settings.