The Roaring Twenties The Roaring Twenties was a golden age of economic prosperity and liberal social change. Innovations in numerous industries revived a sluggish post-World War I economy, and mass production methods allowed for the standardized, rapid production of various goods, the most notable of which was the automobile. The roar of thousands of newly manufactured vehicles filled the city streets, and the ripple effect of the industry spawned a myriad of ancillary industries, such as car dealerships and mechanic shops. Innovations in the entertainment industry heralded the Golden Age of Radio and resulted in the replacement of vaudeville with cinema as