Key Question 2 · 1931–1936
Collapse in the 1930s
Manchuria and Abyssinia exposed the League as powerless against determined aggressors backed by major powers. Cambridge rewards answers that explain WHY the same structure that worked in the 1920s produced catastrophic failure in the 1930s.
Section 1
Why the 1930s Were Different
What changed after 1929?
The Wall Street Crash (October 1929) triggered the Great Depression, which weakened democratic governments across the world, fuelled the rise of aggressive dictatorships, and made nations prioritise economic self-interest over collective security.
The structural weaknesses that had always existed in the League — no standing army, unanimous voting, the absence of the USA — became fatal when combined with the self-interested behaviour of its leading members at the moment those weaknesses were most exposed. The structure did not change. The context did.
Section 2
Manchurian Crisis 1931–33
Japan's invasion of Manchuria was the first major test of collective security against a great power. The League failed it entirely.
What Happened
- ✦ Japan invaded Manchuria, September 1931, claiming a pretext on the Mukden railway
- ✦ Created the puppet state of Manchukuo — a Japanese-controlled territory with a figurehead Chinese emperor
- ✦ The League sent the Lytton Commission to investigate — the report took a full year
- ✦ Commission condemned Japan and recommended withdrawal
- ✦ Japan rejected the finding and simply left the League (March 1933)
- ✦ No military force was deployed. No economic sanctions were applied.
Why the League Failed
- ✦ Britain and France were unwilling to risk war in the Far East or harm their trade with Japan
- ✦ The League had no standing army — military enforcement required members to volunteer forces; none did
- ✦ The USA was not a member and continued trading with Japan throughout — making economic sanctions meaningless
- ✦ The unanimous vote requirement and veto system slowed every decision
- ✦ The Lytton Commission took a year — by the time it reported, Japan had already consolidated full control of Manchuria
Section 3
Abyssinian Crisis 1935–36
Abyssinia was the League's final and most decisive failure. A founding member was invaded by another founding member — and the League's two leading powers secretly negotiated a deal that gave the aggressor most of what he wanted.
What Happened
- ✦ Italy invaded Abyssinia (Ethiopia), October 1935 — a League member attacking another League member
- ✦ The League applied sanctions, but excluded oil, coal and iron — the commodities that would actually have halted the invasion
- ✦ Britain and France refused to close the Suez Canal to Italian ships — this single decision allowed the invasion to continue
- ✦ Italy completed the conquest; sanctions were abandoned in June 1936
- ✦ Abyssinia's Emperor Haile Selassie appealed directly to the League in Geneva — the League could not help him
The Hoare-Laval Pact (1935)
While the League was publicly imposing sanctions on Italy, British Foreign Secretary Samuel Hoare and French Prime Minister Pierre Laval were secretly negotiating a deal to give Mussolini most of Abyssinia in exchange for ending the crisis.
- ✦ The plan was leaked to the French press before it could be implemented
- ✦ Public outrage in Britain and France forced both ministers to resign in disgrace
- ✦ Proved that Britain and France were pursuing national self-interest while publicly claiming to uphold collective security
- ✦ The most powerful single piece of evidence that the League's leading members had no real commitment to its principles
Why Britain and France Held Back
- ✦ Both wanted to keep Mussolini as an ally against Hitler — the Stresa Front (April 1935) depended on Italian cooperation
- ✦ Refused to close the Suez Canal to Italian shipping — closing it would have ended the invasion but risked Italian hostility
- ✦ Their own publics and Dominions were deeply reluctant to go to war so soon after WWI
- ✦ The economic Depression made any sanctions that damaged their own trade politically toxic at home
- ✦ The result: Italy was driven away from Britain and France anyway — and into alliance with Hitler
Historian Judgement — A.J.P. Taylor
Cambridge 0470 — useful for (b) and (c) answers-
Taylor argued the League's "real death was in 1935." Abyssinia — not Manchuria — was the moment when the League's two leading members publicly chose national interest over collective security, making the organisation's collapse irreversible. Cite this as a historian's judgement in (c) answers to demonstrate you can evaluate significance, not just describe events.
Section 4
Why Did the League Fail?
Seven factors — structural and behavioural — combined to end the League as an effective organisation. Learn each one with its specific evidence.
| Letter | Factor | Detail & Evidence |
|---|---|---|
| F | French and British self-interest | The Hoare-Laval Pact secretly offered Mussolini most of Abyssinia while sanctions were publicly in place. Britain and France refused to close the Suez Canal. Both prioritised great-power diplomacy over their obligations under the Covenant. |
| A | Absent powers | The USA never joined — meaning the world's largest economy continued trading with aggressors throughout. Germany was excluded until 1926, the USSR until 1934. The League was never the universal organisation it claimed to be. |
| I | Ineffective sanctions | Sanctions against Italy in 1935 excluded oil, coal and iron — the commodities that would actually have halted the invasion. The decision to protect member states' own trade interests made the sanctions symbolic rather than effective. |
| L | Lack of armed forces | The League had no standing army of its own. Military enforcement required member states to volunteer forces — none ever did in a major crisis. Britain and France were the only powers capable of acting, and both refused. |
| U | Unfair treaties | The League was seen by many as the enforcer of Versailles — a victor's settlement that punished Germany and its allies. This undermined its claim to be a neutral arbiter of international disputes and reduced its moral authority, especially in revisionist states. |
| R | Reaching decisions too slowly | The Lytton Commission took a full year to report on Manchuria — by which time Japan had consolidated control. Unanimous voting in the Assembly and the Council veto system meant every decision moved at the pace of the most reluctant member. |
| E | Economic depression | The Wall Street Crash (1929) and the Depression that followed fuelled the rise of aggressive nationalism and dictatorship. It also made democratic governments prioritise domestic economic recovery over costly foreign commitments — sanctions that hurt home industries were politically impossible. |
Section 5
Examiner Warnings
These errors appear repeatedly in Cambridge examiner reports for 1930s questions.
Examiner Warnings — KQ2: Collapse in the 1930s
Cambridge 0470 ER 2021–2025-
Questions about the League in the 1930s must NOT include Aaland Islands or Upper Silesia. These are 1920s successes. Using them in a 1930s answer suggests you cannot distinguish between the decades and will be penalised for irrelevance. Always check the date range of the question before selecting evidence.
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The Hoare-Laval Pact is the single most powerful piece of evidence that Britain and France were not justified in their handling of Abyssinia. Very few candidates use it. Those who do — and who explain why it matters (it proved both governments were pursuing self-interest while publicly claiming to uphold collective security) — consistently reach Level 4 and Level 5.
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USA's absence undermined sanctions practically — it kept trading with aggressors throughout. It is not enough to say 'the USA wasn't a member'. The consequence is what matters: economic pressure was always incomplete because the world's largest economy was never bound by the League's decisions. Name this specifically in any answer about why sanctions failed.
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The structure of the League was always present — what changed in the 1930s was the behaviour of members combined with the pressure of the Depression. Answers that attribute failure solely to structural weaknesses cannot reach Level 4, because those weaknesses existed throughout the 1920s too. The sophisticated point is that structure and behaviour interacted: the same design that held in 1925 collapsed in 1935 because the political will of leading members had disappeared.
Section 6
Exam Focus
The 1930s crises appear across all three question types and in both (b) and (c) questions about the League's overall record. Know the specific detail of each crisis.
What / Describe questions
- ✦ What was the Lytton Commission?
- ✦ What happened in Manchuria in 1931?
- ✦ What was the Hoare-Laval Pact?
Two specific factual points with precise detail. Who was involved, what was decided, what was the outcome. No analysis required — but vague answers score 1–2 only.
Why / Explain questions
- ✦ Why did the League fail to deal with Manchuria?
- ✦ Why was Abyssinia important for the League?
- ✦ Why were the sanctions against Italy ineffective?
Two developed reasons each with specific evidence. WHY, not WHAT. Include the Hoare-Laval Pact where relevant — it is the single most effective piece of evidence.
How far / Judgement questions
- ✦ How far was the League of Nations a success?
- ✦ Was it the structure or the behaviour of members that caused the League to fail?
Use 1930s evidence as the failure side. Counter with 1920s successes. A Level 5 answer explains WHY the same structure produced such different results in each decade — and reaches a clear 'how far' verdict.
The Key Analytical Move Cambridge Rewards
Structure vs behaviour: the sophisticated answer notes that the structure was always present but became fatal when combined with member self-interest. Neither cause alone fully explains failure. Cambridge consistently rewards answers that show the interaction between the two.
The same unanimous vote requirement that slowed decisions in 1925 also slowed them in 1935. What changed was that in 1935 the aggressors were major powers with military capacity to defy the League, and the leading members — Britain and France — faced a Depression-weakened public, strategic calculations about Hitler, and no desire to go to war.
Frame your conclusion as: The structural weaknesses of the League created the conditions for failure; the self-interested behaviour of its leading members in 1931–36 made that failure inevitable. Neither alone is sufficient.