1. On May 8, 1884, the first regular train service arrived in Phoenix, Arizona. The train was known as the Maricopa and Phoenix Railroad, and it connected Phoenix with the rest of the country, allowing for easier transportation of goods and people.

2. On May 8, 1915, Arizona Governor George W.P. Hunt signed into law a bill that established the Arizona State Library. The library would serve as a central repository for books, information, and knowledge for the state of Arizona.

3. On May 8, 1969, Arizona State University's Sun Devil Stadium was officially dedicated. The stadium was built to replace Goodwin Stadium and was designed to hold up to 70,000 spectators. Since its construction, the stadium has hosted numerous college football games, concerts, and events.

4. On May 8, 1980, the US Senate passed the Central Arizona Project legislation, which authorized the construction of a massive water transmission system that would deliver Colorado River water to central and southern Arizona. The project required the construction of dams, canals, and pipelines, and it remains one of the largest engineering projects in US history.

5. On May 8, 1997, Arizona Governor Jane Hull signed into law a bill that recognized the Navajo language as an official language of the state. The bill was the first of its kind in the US and was designed to recognize the cultural and linguistic heritage of the Navajo people.