Schuman, a member of the French National Assembly from 1919, was arrested by the German Gestapo in September 1940 after the German occupation of France. He escaped in 1942 and worked in the Résistance until France was liberated (1944). A founder of the Popular Republican Movement (Mouvement Républicain Populaire; MRP), he served as minister of finance (July–November 1946), premier (November 1947–July 1948 and August–September 1948), foreign minister (July 1948–December 1952), and minister of justice (1955–56).

While foreign minister he developed the Schuman Plan (1950) to promote European economic and military unity and a Franco-German rapprochement to prevent another war between the two nations. The economic aspects of his plan were realized in 1952 in the European Coal and Steel Community, (European Coal and Steel Community) a six-nation western European economic union, the first in a series of economic agreements leading to the formation of the European Economic Community (the Common Market) in 1958. He served as president of the Assembly, the consultative arm of the Common Market from 1958 to 1960 and was an assembly member until February 1963.