Cultural diplomacy--"winning hearts and minds" through positive portrayals of the American way of life--is a key element in U.S. foreign policy, although it often takes a backseat to displays of military might. Americans All provides an in-depth, fine-grained study of a particularly successful instance of cultural diplomacy--the Office of the Coordinator of Inter-American Affairs (CIAA), a government agency established by President Franklin D. Roosevelt in 1940 and headed by Nelson A. Rockefeller that worked to promote hemispheric solidarity and combat Axis infiltration and...