6, key topic 2 - Early developments in the Cold War, 1945–49
Between 1945 and 1949, the wartime alliance against Nazi Germany turned into a Cold War. This lesson is about the early developments that made that change visible: Soviet control in Eastern Europe, Churchill's "iron curtain" warning, the Truman Doctrine, the Marshall Plan, Soviet counter-measures, disagreements over Germany, and the Berlin Crisis.
The key skill is to connect events. Do not learn the list as separate facts. Each step changed what the next side thought was necessary.
| Date | Development | Why it mattered |
|---|---|---|
| 1945-48 | Soviet-backed communist control spread across much of Eastern Europe | The West saw expansion; Stalin saw a security buffer. |
| 5 March 1946 | Churchill's "iron curtain" speech | The division of Europe became a public warning. |
| 1947 | Truman Doctrine, Marshall Plan, Bizonia, Cominform | Containment became political, economic, and ideological. |
| January 1949 | Comecon created | The Soviet bloc gained its own economic organisation. |
| 24 June 1948-12 May 1949 | Berlin Blockade; the airlift continued after it | The first major Cold War crisis tested both sides in Germany. |
| 4 April 1949 | NATO treaty signed | Western security became a formal military alliance. |
| May-October 1949 | FRG and GDR created | Germany's division became two rival states. |
Soviet Expansion And The Iron Curtain
The Second World War ended with the Soviet Red Army across much of Eastern Europe. That mattered because military power, Soviet diplomacy and local communist parties shaped governments after 1945. In countries such as Poland, Romania, Bulgaria, Hungary and Czechoslovakia, communist parties gained power through a mixture of Soviet backing, pressure on opponents, control of key ministries, and elections that did not develop into open Western-style democracy.
The route differed between countries. Soviet troops left Czechoslovakia in 1945; its February 1948 communist takeover depended on domestic communist strength, control of institutions and Soviet backing, rather than continuing Red Army occupation.
Stalin's argument was security. The Soviet Union had been invaded through Eastern Europe in both world wars, and the Nazi invasion had caused huge destruction and loss of life. A chain of friendly governments to the west of the USSR looked, from Moscow, like a buffer zone.
The Western view was different. The United States and Britain had expected liberated countries to have real political choice. When the Soviet Union used its military position and communist parties to dominate Eastern Europe, Western politicians increasingly saw this as expansion. The same facts could therefore be interpreted in opposite ways:
| Soviet interpretation | Western interpretation |
|---|---|
| Eastern Europe should be friendly to the USSR for security. | Eastern Europe was losing independence to Soviet control. |
| Communism was a legitimate anti-fascist movement after the war. | Communist parties were using Soviet backing to crush rivals. |
| Western criticism was anti-Soviet interference. | Soviet policy broke the spirit of wartime promises about freedom. |
Churchill captured this fear in his speech at Fulton, Missouri, on 5 March 1946. He was not British prime minister at the time, but he was a famous wartime leader, and President Truman was present. Churchill said that an "iron curtain" had descended across Europe. The phrase meant a political and ideological barrier between Soviet-dominated Eastern Europe and the Western democracies.
The speech did not create the Cold War by itself. A good historian's judgement is more careful: Churchill described a division that was already forming, and his words made that division more public and more emotional. To many in the West, he sounded realistic. To Stalin and many communists, he sounded hostile and provocative.
Misconception check: "Soviet expansion" did not mean Soviet tanks conquered all Eastern European countries in one identical way after 1945. It meant the USSR used military occupation, local communist parties, political pressure, police power, and economic influence to create a bloc of states that usually followed Moscow.
Truman Doctrine And Marshall Plan
By 1947, the United States had moved from concern to active containment.
Containment
Containment meant trying to stop communism spreading further, especially where the USA believed Soviet influence might grow.
The Truman Doctrine began with a specific crisis. Britain could no longer afford to support anti-communist forces in Greece or help Turkey resist Soviet pressure. On 12 March 1947, President Truman asked Congress for $400 million in aid for Greece and Turkey. More importantly, he presented the issue as a general principle: the United States would support peoples resisting armed minorities or outside pressure.
This was a major change in U.S. policy. Before the war, the USA had often tried to avoid long-term commitments in European affairs. The Truman Doctrine suggested that American security now depended on preventing communist expansion overseas. In exam terms, its significance was not just the money. It was the message: the USA was prepared to organise resistance to communism.
The Marshall Plan developed containment through economics. In June 1947, Secretary of State George Marshall proposed a European Recovery Program. Europe was physically damaged, short of food and fuel, and economically unstable. The American argument was that poverty and chaos made communism more attractive. Economic recovery would therefore reduce communist appeal and tie Western Europe more closely to the USA.
Congress approved the Economic Cooperation Act in April 1948, and over the next four years the USA provided billions of dollars of aid for European recovery. The plan was offered broadly, but Stalin rejected it and made Eastern European governments reject it too. He feared that accepting American money would weaken Soviet control and pull Eastern Europe into the U.S. economic sphere.
This is why the Marshall Plan hardened the Cold War. To the USA, it was generous reconstruction and anti-communist stability. To the USSR, it looked like economic empire-building. The same policy therefore had two consequences at once: it rebuilt the West and deepened the division between East and West.
Explain economic policy through its intended political mechanism: what instability was being reduced, and why that mattered to the balance of influence.
Cominform And Comecon
The Soviet Union did not simply complain about American policy. It built institutions to tighten its own bloc.
Cominform, the Communist Information Bureau, was set up in 1947. Its purpose was to coordinate communist parties, spread propaganda, and make sure communist parties followed Moscow's line. It included the communist parties of the USSR and several Eastern European states, as well as powerful communist parties in France and Italy.
Cominform mattered because it showed that Stalin wanted ideological discipline. Communist parties were not just national parties making their own choices. They were expected to support the Soviet view of the world and oppose the Truman Doctrine and Marshall Plan. If the USA was organising containment, Cominform was a Soviet answer: keep the communist movement united against American influence.
Comecon, the Council for Mutual Economic Assistance, was created in January 1949. It was the Soviet bloc's economic organisation. Its original members included the USSR, Bulgaria, Czechoslovakia, Hungary, Poland and Romania. It was partly a response to Marshall Aid and Western European economic cooperation.
The simplest difference is:
| Organisation | Date | Main focus | Cold War role |
|---|---|---|---|
| Cominform | 1947 | Political and ideological control | Coordinated communist parties and propaganda. |
| Comecon | 1949 | Economic cooperation in the Soviet bloc | Reduced reliance on the West and answered Marshall Aid. |
Neither organisation made Eastern Europe equal with the USSR. Both strengthened Soviet leadership. Cominform helped define the conflict as ideological: communism against capitalism. Comecon helped define it as economic: a Soviet-led bloc against a U.S.-backed Western recovery system.
Cominform and Comecon are useful for causation. They were consequences of Western policies, especially the Truman Doctrine and Marshall Plan, but they also became causes of deeper division. Once both sides had rival organisations, compromise became harder. Each side could point to the other's actions as proof of threat.
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