On August 8, 1942, 302 people arrived by train at Vocation, Wyoming, to become the first Japanese American residents of what the U.S. government called the Relocation Center at Heart Mountain. In the following weeks and months, they would be joined by some 10,000 of the more than 120,000 people of Japanese descent, two-thirds of them U.S. citizens, incarcerated as “domestic enemy aliens” during World War II. Heart Mountain became a town with workplaces, social groups, and political alliances—in short, networks. These networks are the focus of Saara Kekki’s Japanese Americans at Heart Mountain.