How does the author support the idea that the Navajo men who volunteer to fight in the world war ii had been living isolated lives?

The author illustrates that the Navajo men who volunteered for World War II had been living in isolation by highlighting their limited exposure to the outside world and the challenges they faced in their rural communities. Many of them grew up in a traditional lifestyle, with minimal interaction with non-Navajo cultures, which contributed to their sense of separation. The author also emphasizes their motivations for joining the military as a means to escape this isolation and seek new opportunities, showcasing the contrast between their previous lives and the broader world they were stepping into.