International Military Alliance Data, 1920-1957

This study contains data on 137 international alliances signed in the period 1920-1957. Data are provided for the background of the alliance, year the alliance was signed, and type, terms, length, and cause of termination of the alliance. Also provided is information on the ratio of the total population of each alliance member to the total population of the world, average distance between the capitals of the alliance members, positions of alliance members in relation to each another when war occurred while the alliance was operative, and whether any member of the alliance established military bases on the territory of another member, gave or received military or economic aid, or faced any specific threat from a particular region or nation. Demographic information on alliance members includes race, languages, and religion.