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Third and fourth terms (1941–1945)
Main article: Presidency of Franklin D. Roosevelt, third and fourth terms
Further information: Foreign policy of the Franklin D. Roosevelt administration
World War II dominated Roosevelt's attention, with far more time devoted to world affairs than ever before. Domestic politics and relations with Congress were largely shaped by his efforts to achieve total mobilization of the nation's economic, financial, and institutional resources for the war effort. Even relationships with Latin America and Canada were structured by wartime demands.  Roosevelt maintained close personal control of all major diplomatic and military decisions, working closely with his generals and admirals, the war and Navy departments, the British, and even the Soviet Union.  His key advisors on diplomacy were Harry Hopkins (who was based in the White House), Sumner Welles (based in the State Department), and Henry Morgenthau Jr. at Treasury. In military affairs, Roosevelt worked most closely with Secretary Henry L. Stimson at the War Department, Army Chief of Staff George Marshall, and Admiral William D. Leahy.