Steel manufacturing was at one point the most important industry in the United States. It was one of the biggest employers, a driver of economic growth, and it shaped our national security. Cars, weapons, skyscrapers... all needed steel. But in the second half of the 20th century, the industry's power started to decline. Foreign steel companies gained more market power and the established steel industry in the U.S. was hesitant to change and invest in newer technologies. But then, a smaller company took a chance and changed the industry. On today's episode: What can the fall of a once-great industry teach us about innovation and technology? And why you should never underestimate an underdog. This episode was hosted by Erika Beras and Mary Childs. It was produced by Willa Rubin and edited by Jess Jiang. It was engineered by Cena Loffredo. It was fact-checked by Sierra Juarez. Our executive producer is Alex Goldmark. Help support Planet Money and get bonus episodes by subscribing to Planet Money+ in Apple Podcasts or at plus.npr.org/planetmoney. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy