America: What's in a Name?

The Professor starts off his January 2024 "What is America" series of shows with a short episode that looks at the naming of "America" and the naming of the "United States of America." Was America named after Amerigo Vespucci, as we were all taught in school? Why was it named after him? And when did Americans first start to refer to the "United States," rather than the "colonies"? Episode 541