The origins and blame for the Cold War
Explain the breakdown of the US–Soviet alliance in 1945–46, Soviet control in Eastern Europe by 1948, American reactions, Germany and Berlin, NATO and the Warsaw Pact, comparing interpretations of blame.
Section B4 · Who was to blame for the Cold War?
Exam scope and assessment notes
This original lesson maps Cambridge IGCSE History 0977 key question B4 for exams in 2024–2030. 0470 uses grades A*–G; 0977 uses grades 9–1 and has limited zone availability. Cambridge states that the 2029–2030 syllabus has no significant changes affecting teaching and that resources for examinations from 2024 remain suitable. This pathway maps the shared subject content across the published 2024–2030 cycles; always use the exact exam-year syllabus, exam-series prescribed topic and centre route. Cambridge 0977 is offered only in specified administrative zones and locations; confirm that your centre can enter this grading route and exam series. StudyForA explanations, examples and practice are original learning materials, not Cambridge questions, source documents, mark schemes or grades. Paper 2's prescribed topic changes each exam series: use the exact topic for your year and series from Cambridge. Source-analysis exercises here use clearly labelled, invented practice claims and do not reproduce historical documents. Component 3 is centre-approved coursework based on a depth study and needs authentic learner work, supervision, internal assessment and Cambridge moderation; StudyForA cannot conduct, authenticate or award that coursework mark. Practice feedback is formative and is not an official Cambridge grade.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
How should you approach this question: Who was to blame for the Cold War?
What you will learn
- Explain the wartime alliance's breakdown at the 1945 summit conferences and through 1945–46 disagreements.
- Explain Soviet expansion into Eastern Europe to 1948 and American reactions including containment policies.
- Explain the occupation of Germany, the Berlin Blockade, NATO and the Warsaw Pact, and evaluate competing explanations of blame.
Alliance breakdown and Europe
The 1945 summit conferences and breakdown of the US–Soviet alliance in 1945–46 created mistrust over security, political systems and post-war arrangements.
The USSR established control in Eastern Europe by 1948; assess local conditions and Soviet actions rather than assuming every country followed the same path. American reactions included containment, the Truman Doctrine and Marshall aid. Explain how each side's actions appeared defensive to itself and threatening to the other.
Germany, Berlin and competing explanations
Germany's occupation and the Berlin Blockade intensified conflict; the Berlin Airlift helped supply West Berlin. NATO and later the Warsaw Pact institutionalised opposing security alliances. Sequence actions and responses to show escalation.
Historical interpretations differ over whether Soviet security concerns, US power and economic policy, ideological conflict or the decisions of both governments mattered most. Test arguments against chronology and evidence and avoid reducing a complex origin to one villain.
Sources for this lesson
- Cambridge IGCSE History 0470 · 2024–2026 syllabus
- Cambridge IGCSE History 0470 · 2024–2026 syllabus update
- Cambridge IGCSE History 0470 · 2027–2028 syllabus
- Cambridge IGCSE History 0470 · 2029–2030 syllabus
- Cambridge IGCSE (9–1) History 0977 · 2024–2026 syllabus
- Cambridge IGCSE (9–1) History 0977 · 2027–2028 syllabus
- Cambridge IGCSE (9–1) History 0977 · 2029–2030 syllabus
- Cambridge IGCSE History 0470 qualification page
- Cambridge IGCSE (9–1) History 0977 qualification page
Pause and explain
Why should the Cold War be explained as a sequence of action and response?
Worked example
Who was more responsible for the Cold War?
Show the worked solution
- Set a time period and define what counts as responsibility.
- Compare Soviet actions in Eastern Europe with American policy and the responses to Germany and Berlin.
- Use the security concerns and evidence of both sides to reach a qualified judgement.
Answer Responsibility can be shared but not necessarily equal in every episode. Soviet control in Eastern Europe and US policies each heightened the other's fears. The strongest judgement explains how actions, motives and responses developed across 1945–49 rather than treating the Cold War as inevitable from ideology alone.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Explain how Soviet control in Eastern Europe and American reactions contributed to rising tension.
Give me a hint
Start with one named syllabus fact, explain its effect and connect it to the question.
Compare my reasoning
- Select accurate evidence: control in Eastern Europe and American containment actions each shaped the other side's fears.
- Explain the link between that fact and the issue being tested.
- Add a second condition or limitation before reaching a short answer. A model answer follows: The USSR's expanding control by 1948 raised concerns in the United States about further Soviet influence. American policies intended to contain that influence appeared threatening to Soviet leaders. Each side interpreted the other's measures through its own security concerns, creating a cycle of action and reaction.
The USSR's expanding control by 1948 raised concerns in the United States about further Soviet influence. American policies intended to contain that influence appeared threatening to Soviet leaders. Each side interpreted the other's measures through its own security concerns, creating a cycle of action and reaction.
Look for these in your work
- Uses a relevant named fact
- Explains a cause, consequence or comparison
- Qualifies the conclusion with evidence
Who was more responsible for the Cold War's origins by 1949?
Give me a hint
Choose a clear criterion for importance or success; compare evidence before you decide.
Compare my reasoning
- Select accurate evidence: control in Eastern Europe and American containment actions each shaped the other side's fears.
- Compare the strongest supporting evidence with a counterpoint.
- State which factor matters most, for whom and during which period. A model answer follows: A defensible answer compares Soviet control in Eastern Europe and the Berlin crisis with American containment policies and alliance building. Each side made choices that affected the other; the weight assigned depends on evidence about aims, actions and alternatives. Avoid claiming that shared responsibility means equal responsibility in every event.
A defensible answer compares Soviet control in Eastern Europe and the Berlin crisis with American containment policies and alliance building. Each side made choices that affected the other; the weight assigned depends on evidence about aims, actions and alternatives. Avoid claiming that shared responsibility means equal responsibility in every event.
Look for these in your work
- Selects evidence from the correct period
- Weighs more than one factor
- Makes a supported judgement
Original StudyForA practice claim (not a historical source): ‘The Cold War began because two ideologies could never coexist.’ Evaluate the claim.
Give me a hint
Treat the prompt as an interpretation to test. Identify what evidence supports it and what it leaves out.
Compare my reasoning
- Select accurate evidence: control in Eastern Europe and American containment actions each shaped the other side's fears.
- Check the claim against at least two relevant pieces of contextual knowledge.
- Explain a limitation or alternative explanation; do not treat an invented practice prompt as a real historical source. A model answer follows: Ideological rivalry mattered, but it cannot explain the timing or sequence by itself. Examine post-war security, control in Eastern Europe, German occupation, the Berlin Blockade and each government's policies. Ideology shaped interpretation, while political decisions and responses turned disagreement into sustained confrontation.
Ideological rivalry mattered, but it cannot explain the timing or sequence by itself. Examine post-war security, control in Eastern Europe, German occupation, the Berlin Blockade and each government's policies. Ideology shaped interpretation, while political decisions and responses turned disagreement into sustained confrontation.
Look for these in your work
- Tests rather than repeats the claim
- Uses contextual knowledge to support or challenge it
- Explains a limitation and reaches a qualified conclusion
Common mistakes
- Treating one side's stated security concerns as unquestionable fact
- Ignoring the other side's actions and perceptions
- Using NATO or the Berlin Blockade without placing them in sequence
What can you explain now?
Why should the Cold War be explained as a sequence of action and response?
Compare with the explanation
What is needed to compare responsibility fairly?
Build an evidence-led answer: describe the relevant context, explain how it supports the claim, test it against another factor or limitation, and reach a qualified judgement.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Without looking, state the key question, name two syllabus facts that bear on it, and explain one limit to your first conclusion.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.