A new book, "The Westerners: Mythmaking and Belonging on the American Frontier," weaves together the stories of seven historical characters as they crisscross the American West in the 1800s. Some of them, like Sacajawea, you’ll recognize. Pulitzer-finalist Megan Kate Nelson says there are others we should know more about but just don’t. We discuss why setting Western history straight is so crucial to the American project.