many studies have examined John Foster Dulles’ role as secretary of state during the Eisenhower Administration, few works have concentrated on his involvement with international organization. This book examines the evolution of Dulles’ thought on international organization and his actual involvement with international organization from 1919 until his death in 1959. It reveals that Dulles’ earlier experiences played an important role in shaping his policymaking, but that in the mid-1940s his conception of the international system underwent a major change that affected his later thought on international organization.