When World War II began in September 1939, the neutrality laws were still in effect and ensured that no substantial support could be given to Britain and France. With the revision of the Neutrality Act in 1939, Roosevelt adopted a "methods-short-of-war policy" whereby supplies and armaments could be given to European Allies, provided no declaration of war could be made and no troops committed. By December 1940, Europe was largely at the mercy of Adolf Hitler and Germany's Nazi regime. With Germany's defeat of France in June 1940, Britain and its overseas Empire stood alone against the military alliance of Germany, Italy, and Japan. Winston Churchill, as Prime Minister of Britain, called for Roosevelt and the United States to supply them with armaments in order to continue with the war effort.