Why did Churchill and FDR make an alliance with Stalin

FDR, Churchill and Stalin met together for the first time in November of 1943 during the historic Tehran Conference. ... “What Stalin wanted to do was to revive Russia as a great world power,” says Susan Butler, author of Roosevelt and Stalin: Portrait of a Partnership. “Stalin was perfectly happy to do what FDR wanted.

While the war in Europe was winding down, Roosevelt knew the United States still faced a protracted struggle against Japan in the Pacific War, and wanted to confirm Soviet support in an effort to limit the length of and casualties sustained in that conflict.

The Tehran Conference (codenamed Eureka) was a strategy meeting of Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill from 28 November to 1 December 1943, after the Anglo-Soviet Invasion of Iran. ... A separate protocol signed at the conference pledged the Big Three to recognize Iran's independence.

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