Charles Evans Hughes had the good fortune to serve as secretary of State to President William Harding, who had little interest in foreign policy, giving Hughes free rein. Hughes was influential in post-World War I disarmament talks and revitalized relations with Latin America.
George Marshall lent his name to the Marshall Plan, which generously provided for Western Europe's reconstruction as democratic, free-market economies after World War II. The plan, for which Marshall won the Nobel Peace Prize, still serves as a touchstone of successful US diplomatic intervention.
Dean Acheson is considered the consummate modern American statesman and architect of an American world order in the cold-war era. He encouraged President Truman to take the side of South Korea against a bellicose North, and defended State Department officers from the accusations of treason launched by Sen. Joseph McCarthy.