 Some of the many storytellers and monologists on early 1920s American radio might be able to claim even earlier dates.Perhaps America's most famous radio drama broadcast is Orson Welles' "The War of the Worlds" (a 1938 version of H. G. Wells' novel), which convinced large numbers of listeners that an actual invasion from Mars was taking place.By the late 1930s, radio drama was widely popular in the United States (and also in other parts of the world).