The document discusses the history and development of California from its earliest inhabitants to the early 20th century. It describes how native Californians spoke over 135 separate languages and faced near extinction due to European contact. It also outlines how California's infrastructure and population grew tremendously in the late 19th/early 20th century, especially in Los Angeles and San Francisco, fueled by water projects like dams and aqueducts. As the population and economy expanded, labor movements emerged to improve working conditions for agricultural and other workers.