Rivalry and Alliance Politics in Cold War Latin America, Christopher Darnton's comparative study of the nature of conflict between Latin American states during the Cold War, provides a counterintuitive and shrewd explanation of why diplomacy does or doesn't work. Specifically, he develops a theory that shows how the "parochial interests" of state bureaucracies can overwhelm national leaders' foreign policy initiatives and complicate regional alliances.

His thorough evaluation of several twentieth-century Latin American conflicts covers the gamut of diplomatic disputes from...