The origins of the Cold War, including ideological differences, the wartime conferences at Yalta (February 1945) and Potsdam (July to August 1945), and the breakdown of the Grand Alliance

What this dot point is asking

NESA expects you to explain how the Grand Alliance of the United States, Britain, and the USSR broke down between February 1945 and the end of 1945, with the Yalta and Potsdam conferences as the central diplomatic events. Strong answers integrate ideological difference, wartime grievance, the death of Roosevelt, the atomic bomb, and Stalin's actions in Poland.

The answer

The wartime alliance

The Grand Alliance was formed by necessity, not ideology. The Anglo-Soviet Treaty (26 May 1942) and the Declaration by United Nations (1 January 1942) bound the three powers to the defeat of the Axis. Roosevelt described the relationship as "the four policemen" who would keep the post-war peace. The alliance contained latent tensions from the start: Soviet resentment at the delayed Second Front (Anglo-American forces landed at Normandy on 6 June 1944, three years after Operation Barbarossa), Anglo-American suspicion of Soviet intentions in Eastern Europe, and ideological enmity dating to the 1917 revolution and the 1918 to 1920 Allied intervention in the Russian Civil War.

The Yalta Conference, 4 to 11 February 1945

The Big Three met at the Livadia Palace in Crimea. The war was effectively won in Europe; Soviet armies were 65 kilometres from Berlin.

Agreements: Germany would be occupied in four zones (American, British, Soviet, and a French zone carved from the western zones); Berlin, deep in the Soviet zone, would be similarly divided; the USSR would enter the Pacific war within three months of Germany's defeat in return for territorial concessions in Manchuria and the southern Sakhalin; the United Nations would be founded with permanent Security Council vetoes; the Declaration on Liberated Europe promised "free elections" in liberated countries.

The Polish question was deferred. Stalin had installed the Lublin Committee (the Polish Committee of National Liberation, July 1944) as the de facto government; the London-based Polish government in exile demanded recognition. Yalta agreed the Lublin government would be "reorganised on a broader democratic basis" with free elections "as soon as possible." The phrase carried different meanings in each capital.

Roosevelt's death and the changeover

Roosevelt died on 12 April 1945. Harry Truman, vice-president for 82 days, had been excluded from the Manhattan Project and from much foreign policy. He was briefed on the bomb on 25 April. His instinctive view of Stalin was harsher than Roosevelt's. On 12 May 1945, four days after VE Day, Truman abruptly cut Lend-Lease shipments to the USSR; the order was rescinded after Soviet protest, but the signal was registered.

The Potsdam Conference, 17 July to 2 August 1945

The Big Three met at the Cecilienhof Palace in Potsdam, outside ruined Berlin. Truman replaced Roosevelt; Attlee replaced Churchill on 28 July after Labour's election win. Stalin alone remained.

On 16 July the Trinity test in New Mexico succeeded; Truman was informed at Potsdam on 17 July. On 24 July he mentioned to Stalin that the United States had "a new weapon of unusual destructive force." Stalin, already informed by Soviet intelligence (Klaus Fuchs and others), nodded.

Agreements: the Allied Control Council would govern Germany; the four "Ds" (demilitarisation, denazification, democratisation, decartelisation) were adopted; Germany's eastern border was provisionally moved to the Oder-Neisse line, with German populations expelled "in an orderly and humane manner" from Poland, Czechoslovakia, and Hungary; reparations would be drawn primarily from each occupying power's zone, with the USSR receiving an additional 25 per cent of industrial equipment from the western zones in exchange for food.

Disagreements: Polish elections were not specified; the Lublin government was provisionally recognised; the Council of Foreign Ministers was created to handle peace treaties; Soviet demands for a trusteeship over former Italian colonies and a base on the Turkish Straits were refused.

The Potsdam Declaration (26 July 1945), issued by the United States, Britain, and China (not the USSR), demanded Japan's "unconditional surrender" and threatened "prompt and utter destruction." Hiroshima was bombed on 6 August, Nagasaki on 9 August.

Stalin's view, Truman's view

Stalin's reading: the war had cost 27 million Soviet dead; "friendly governments" in Eastern Europe were a security necessity; the Anglo-American powers had delayed the Second Front for three years; the atomic bomb had not been shared.

Truman's reading: Stalin had broken the Yalta promise on Polish elections; Soviet behaviour in Eastern Europe demonstrated expansionist intent; the United States held an atomic monopoly that could be used as leverage.

Ideological differences

Marxism-Leninism predicted the collapse of capitalism and the inevitability of conflict between the systems. Stalin's February 1946 election speech revived this view, predicting that capitalist contradictions would produce a new war.

American liberalism rested on free markets, free elections, and self-determination. The 1941 Atlantic Charter and 1945 UN Charter encoded these as universal principles. Soviet behaviour was read as a violation of the post-war order.

Timeline of the breakdown

Historiography

The orthodox view (Schlesinger, Feis) blamed Stalin's expansionism. The revisionist view (Williams, Kolko) blamed American economic imperialism and atomic diplomacy. The post-revisionist view (Gaddis) treats the breakdown as the structural product of two superpowers in the vacuum left by Germany and Japan. Gaddis's later work after the Soviet archives (We Now Know, 1997) returned weight to Stalin's ideology and personal paranoia.

Common exam traps

Treating Yalta as the cause

Yalta was a compromise; Potsdam was where the compromises failed. The structural causes predated both.

Forgetting Truman is not Roosevelt

The 12 April 1945 succession matters. Roosevelt's flexibility was replaced by Truman's bluntness.

Misdating the atomic bomb

Trinity was 16 July 1945. The bomb was not yet operational at Yalta.

In one sentence

The Grand Alliance broke down between February and August 1945 as Yalta's "free elections" formula in Eastern Europe collided with Stalin's installed Lublin government in Poland, Roosevelt's death (12 April) replaced flexibility with Truman's tougher line, the Trinity test (16 July) gave Washington a monopoly weapon, and Potsdam (17 July to 2 August) recorded the deadlock that orthodox historians blame on Stalin, revisionists on American atomic diplomacy, and post-revisionists on the structural vacuum left by the Axis.

Examples in context

Example 1. The Yalta Declaration on Liberated Europe (11 February 1945). The text promised "free and unfettered elections" but committed no enforcement. John Lewis Gaddis (We Now Know, 1997) reads Yalta as Stalin's bid for security through control of Poland; Vladislav Zubok (A Failed Empire, 2007) draws on the Politburo records to show Stalin already expected an exclusive Soviet sphere. Melvyn Leffler (For the Soul of Mankind, 2007) emphasises mutual misperception. The Declaration is examinable because the same text was read by Roosevelt as a democratic promise and by Stalin as cover for a security buffer.

Example 2. The Potsdam Communique (2 August 1945) and the atomic test. Truman wrote in his diary on 17 July that he had told Stalin of a "new weapon of unusual destructive force"; Zhukov later recalled that Stalin already knew. Martin Sherwin (A World Destroyed, 1973) frames Potsdam as the moment atomic monopoly entered diplomacy. Gar Alperovitz (Atomic Diplomacy, 1965) advanced the revisionist case that the bomb was used to intimidate Moscow. Tsuyoshi Hasegawa (Racing the Enemy, 2005) complicates both by showing Soviet entry into the Pacific war was the larger Japanese variable.

Try this

Q1. Source A is the Yalta Declaration on Liberated Europe (11 February 1945) on "free and unfettered elections." Using Source A and your own knowledge, explain why Yalta failed to settle the future of Eastern Europe. [5 marks]

• What the marker wants. Identify ambiguity of the text; cite Polish question (London vs Lublin Poles); pair with the absence of an enforcement mechanism.

Q2. Evaluate the extent to which the wartime conferences of 1945 made the Cold War inevitable. [25 marks]

• What the marker wants. Weigh ideological gap, Polish question, and atomic monopoly; use Gaddis, Zubok, Leffler; cite specific protocols.

Q3. Compare the views of John Lewis Gaddis and Melvyn Leffler on the origins of the Cold War. [10 marks]

• What the marker wants. Gaddis (Stalin's authoritarian personality and ideology decisive) versus Leffler (mutual misperception and security dilemmas); judgement.