The capital city of the state of Arizona, Phoenix is also known as the “Valley of the Sun.” It was originally settled as an agricultural area that modeled its early irrigation systems on the ancient Hohokam canal system that riddled the valley floor. As with most Southwestern frontier towns Phoenix went through several iterations including periods of Mexican and New Mexican territorial management. The entrance of the railroad, and later the post-World War Two automobile and baby booms, led the city’s population to soar. Phoenix became one of the largest cities in the U.S., despite being located in one of the most water-poor fringes of the Sonoran desert.