Winston Churchill became Prime Minister of Great Britain in 1940, replacing the ineffective Neville Chamberlain. As war leader in Britain, Churchill helped the Soviet Union when Germany launched its invasion of the communist country in 1941, and he forged a strong, personal relationship with United States President Franklin Roosevelt, from whom Britain received much-needed aid in the early years of the conflict and before America was officially at war with Germany or Japan.
Churchill and Roosevelt developed much of the strategy for the allies during the war. He met with Roosevelt and Soviet Premier Josef Stalin at Teheran and Yalta to discuss both strategy and the division of Europe and Germany after the end of hostilities.
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