After Dwight Eisenhower won the 1952 presidential election, he chose Dulles as Secretary of State. Throughout his tenure, Dulles favored a strategy of massive retaliation in response to Soviet aggression and concentrated on building and strengthening Cold War alliances, most prominently the North Atlantic Treaty Organization. He was the architect of the Southeast Asia Treaty Organization, an anti-Communist defensive alliance between the United States and several nations in and near Southeast Asia. He also helped instigate the 1953 Iranian coup d'état and the 1954 Guatemalan coup d'état. Dulles advocated support of the French in their war against the Viet Minh in Indochina but rejected the Geneva Accords between France and the communists, instead supporting South Vietnam after the Geneva Conference in 1954. Suffering from colon cancer, Dulles resigned from office in 1959 and died later that year.