- Define and explain Origins of the Cold War in your own words
- Use key terms such as Superpower accurately
- Apply what you have learned to new examples and questions
- Avoid the common mistakes learners make with this topic
For over forty years the USA and the USSR confronted each other across a divided world, armed with nuclear weapons but never fighting directly. The Cold War shaped everything from space travel to school drills. This chapter traces how the rivalry began, why it stayed cold, and how it ended.
This lesson focuses on Origins of the Cold War: from wartime allies to superpower rivals, 1945-1949.
From wartime allies to superpower rivals, 1945-1949.
Key ideas
From allies to rivals
In 1945 the USA, USSR and Britain were victorious wartime allies, but they disagreed sharply about post-war Europe. At Yalta (February 1945) and Potsdam (July 1945) Stalin insisted on pro-Soviet governments in Eastern Europe as a buffer against future invasion, while the Western Allies wanted free elections. Germany was divided into occupation zones, and arguments over reparations deepened mistrust. By 1946 Churchill was warning that an "iron curtain" had descended across Europe.
Drawing the lines, 1947-1949
Two events in 1947 turned rivalry into a permanent split. The Truman Doctrine committed the USA to supporting any nation resisting communist takeover, starting with Greece and Turkey. The Marshall Plan (1948) then offered massive US economic aid to rebuild Western Europe — which Stalin forbade Eastern Europe from accepting. The Berlin Blockade of 1948-49, when the USSR cut off road and rail access to West Berlin and the Allies responded with a year-long airlift, proved Germany — and Europe — was now divided in two. In 1949 the Western powers formed NATO, a military alliance against Soviet expansion.
Key term — Superpower: A state with global military, economic and political influence. After 1945 only the USA and USSR qualified.
Why is the Berlin Blockade (1948-49) often called the moment the Cold War "turned cold" in Europe?
First, identify what happened: the USSR blocked all road and rail routes into West Berlin, trying to force the Western Allies out. Next, note the Allied response: rather than fight through, they supplied the city entirely by air for almost a year. Finally, draw the conclusion: the crisis proved neither side would back down over Germany, so the division of Europe into hostile blocs was now permanent.
Answer: The blockade showed both sides would hold their ground in Germany without going to war, cementing Europe's division into rival blocs.
- Saying the Cold War was only about the USA and USSR It drew in the whole world: Korea, Vietnam, Afghanistan and many decolonising states became Cold War battlegrounds, often at terrible local cost.
- Naming a single starting date for the Cold War Historians disagree: some point to 1945 and the Yalta disagreements, others to the Truman Doctrine in 1947, others to the Berlin Blockade in 1948. What matters is the pattern of deepening rivalry, not one day.
Practice
Stalin wanted pro-Soviet governments in Eastern Europe as a buffer; the Western Allies wanted free elections. They also clashed over German reparations.
That the USA would support any nation resisting communist takeover — first applied to Greece and Turkey.
Because accepting US economic aid would have pulled Eastern European states into the Western economic orbit and loosened Soviet control over them.
With the Berlin Airlift: for almost a year Allied planes flew food, fuel and supplies into West Berlin around the clock.
Quick check
Which of these best defines "Superpower"?
Which 1948–49 crisis proved that Germany — and Europe — was now permanently divided?
- Origins of the Cold War: from wartime allies to superpower rivals, 1945-1949.
- From allies to rivals: At Yalta and Potsdam the Allies split over Eastern Europe's future and German reparations; Churchill soon warned of an "iron curtain".
- Drawing the lines, 1947-1949: The Truman Doctrine, the Marshall Plan, the Berlin Blockade and the founding of NATO turned rivalry into permanent division.
- Watch out for: saying the Cold War was only about the USA and USSR