The document provides a history of radio broadcasting, beginning with Marconi's invention of wireless telegraphy in the late 19th century. This led to further developments like Hertz's discovery of radio waves and Bell's telephone invention, bringing the world closer to radio broadcasting. The first official radio broadcast was in 1920 by station KDKA. Radio flourished in the 1920s as more stations emerged and broadcasting became more entertainment-focused. The Great Depression of the 1930s increased radio's popularity and new technologies like FM radio were introduced. Radio experienced its "golden age" from the mid-1930s to 1950 as local broadcasters focused on their own programming over networks.