Faced with the possibility of being drawn into a war on several fronts, the United States sought to win Mexican support for a new strategy of Hemispheric Security, based on defense collaboration by governments throughout the Americas. U.S. leaders were concerned that Mexico might become a base for enemy operations, a scenario that, given the presence of pro-Axis lobbies in Mexico and the rumored fraternization between Mexico and Germany in World War I, seemed far from implausible in 1939-41.

Strategy, Security, and Spies tells the fascinating story of U.S. relations with...