The Broken Alliance, 1945–1947

The alliance between the United States, Britain, and the Soviet Union had always been a marriage of necessity rather than ideology. What held it together was the shared enemy: Nazi Germany. Once that enemy was gone, the contradictions reasserted themselves quickly.

At Yalta in February 1945, Franklin Roosevelt, Winston Churchill, and Joseph Stalin negotiated the shape of the postwar world while Germany was still fighting. The agreements were vague enough to mean different things to each party. Stalin understood them to guarantee Soviet security through a sphere of influence across Eastern Europe. Roosevelt hoped they promised free elections and eventual liberalization. The gap between those interpretations would widen within months.

Stalin had reason to be preoccupied with security. The Soviet Union had absorbed roughly 27 million military and civilian deaths in the war against Germany — an almost incomprehensible toll. Whatever the ideological competition might demand, Stalin's immediate priority was ensuring that no powerful hostile state could ever again invade Soviet territory from the west. Control over Poland, Romania, Bulgaria, Czechoslovakia, and Hungary was not simply imperial appetite; it was, in Soviet thinking, a non-negotiable buffer zone.

The new American president, Harry Truman, had far less sympathy for Soviet concerns. He came to office in April 1945 with little foreign policy preparation and a harder temperament than Roosevelt. By the Potsdam Conference in July 1945 — the final wartime summit — the atmosphere between the Allies had already noticeably cooled. Truman received word at Potsdam that the United States had successfully tested an atomic bomb. The implications were not lost on either side.

The peace that followed the war in 1945 was not a stable settlement. It was a freeze. Soviet troops remained in Eastern Europe and proceeded to assist local Communist parties in consolidating power. In Poland, the London government-in-exile was sidelined. In Romania and Bulgaria, opposition politicians faced systematic pressure. The elections that Stalin had agreed to at Yalta were either postponed, manipulated, or replaced with one-party plebiscites.

The Western response was initially cautious. Britain was financially exhausted and retreating from empire. The United States had demobilized rapidly, bringing most of its army home. For a year after the war, American policy hoped that a combination of economic inducement and diplomatic engagement might steer the Soviets toward accommodation. Those hopes faded through 1946.

Churchill's Iron Curtain speech in Fulton, Missouri in March 1946 gave a name to what was already visible. The Soviets were building a separate sphere, and the Western democracies had to decide whether to accept it or resist it. The speech was controversial at the time — Churchill was no longer in power, and Truman administration officials were cautious about endorsing it publicly — but its diagnosis proved accurate.

The critical turning point came in early 1947. Britain, facing fiscal collapse, informed Washington that it could no longer financially support the governments of Greece and Turkey, both under pressure from Communist insurgencies and Soviet diplomacy. The British withdrawal created an immediate question: would the United States step in? Truman's answer came in March 1947. Addressing Congress, he articulated what became known as the Truman Doctrine: the United States would support free peoples who were resisting subjugation by armed minorities or outside pressures. The language was global and open-ended. The alliance of necessity was formally over, and what replaced it was a contest of systems.

The Broken Alliance, 1945–1947

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