40. Cities east of the Appalachians which were established at the sites of water- falls are called

The cities you’re referring to are often known as "fall line cities." These urban centers sprung up right where rivers cascade over hard rock, marking a shift from the coastal plain to the piedmont region. The waterfalls served as perfect locations for early mills and factories, attracting settlers looking for waterpower to fuel their industries. Interestingly, many of these cities, like Richmond and Nashville, prospered not just from their manufacturing roots, but also became cultural hubs, showcasing a unique blend of Southern traditions, music, and history that draws visitors even today. So the next time you stroll through one of these vibrant cities, remember you’re walking on historic industrial grounds!