The Golden Age of Radio, roughly the Depression era through World War II, spanned a time of great innovation and upheaval in the United States. Radio became the means by which Americans kept abreast of changing political, economic, and technological trends. This site from the Digital Public Library of America tracks the history of the radio, from its origins in the telegraph system to its contributions to America's efforts in World War I and World War II, from the beginning of Broadcast News to the way radio shaped American homes. The site is divided into five sections, each with several historical photographs and well written, informative text.