Key Question 2 · League of Nations
The League's Structure
Understand the four main bodies, what collective security actually meant in practice, and the structural weaknesses Cambridge rewards you for analysing — not just listing.
Section 1
The Main Bodies
The League had four principal organs. Examiners expect you to treat these as distinct institutions — each had different membership, meeting frequency, and powers.
The Assembly
The parliament of all member states — every member had one vote and one seat. Met once a year in Geneva. Decisions required a unanimous vote, which in practice gave every member state a veto. Handled the League's budget and admitted new members.
The Council
The League's executive body, with four permanent members — Britain, France, Italy, Japan — each holding a veto. Temporary members (initially four, later rising to nine) were elected by the Assembly for three-year terms. Met approximately five times a year and in emergencies. Could apply moral condemnation, economic sanctions, or military force — in that escalating sequence.
Permanent Court of International Justice
Based at The Hague in the Netherlands. Settled disputes between member states — primarily border and treaty disagreements — by applying international law. Its rulings were legally binding in theory, but the Court had no mechanism to enforce its own judgements. It relied entirely on states choosing to comply.
The Secretariat
The League's permanent civil service, headed by the Secretary-General. Kept official records of decisions and correspondence, prepared agendas, and coordinated the work of the specialist commissions (ILO, Health Committee, Refugees, Slavery). Provided the administrative continuity the Assembly and Council lacked between sessions.
Section 2
Collective Security
This concept is one of the most commonly misunderstood in the whole specification. Getting it right is the difference between Level 2 and Level 4.
What did collective security actually mean?
Collective security was not an automatic military alliance. An attack on one League member did not immediately trigger military involvement by all others.
The correct sequence, as set out in the Covenant, was a deliberate escalation:
- Moral condemnation — the Council publicly declared a member in breach of the Covenant.
- Economic sanctions — member states agreed to stop trading with the aggressor.
- Military force — a last resort, requiring member states to voluntarily contribute troops.
Because the League had no standing army of its own, military action always depended on members being willing to fight — and members with their own interests at stake frequently were not. Cambridge explicitly penalises students who describe collective security as an immediate military guarantee.
Examiner Warning
Collective security was not a firm military alliance. Candidates who describe it as 'all members immediately go to war if one is attacked' are marked down. The system required escalating steps — and crucially, each step depended on member states choosing to act in the collective interest rather than their own.
Section 3
Key Structural Weaknesses
These weaknesses were built into the League from 1919. Cambridge rewards answers that explain why each weakness mattered — not just that it existed.
| Weakness | Detail |
|---|---|
| USA never joined | The US Senate rejected membership in 1919–20 — twice. Without the world's largest economy, economic sanctions could never be fully effective: aggressors could simply keep trading with the USA. It also meant the League lacked the military and moral authority of its most powerful potential guarantor. |
| Germany excluded until 1926 | Germany was barred from joining as punishment for starting the war. This reinforced the League's image as a victors' club rather than a universal organisation. Germany's exclusion also removed any chance of cooperation from the most powerful continental European state during the League's crucial early years. |
| USSR excluded until 1934 | The Soviet Union was not invited to join — partly due to ideological hostility and partly because the Allies had intervened in the Russian Civil War. Another major power absent from the table meant collective security was incomplete by design. |
| No standing army | The League had no forces of its own. Military action required member states to volunteer troops — and no member was ever obliged to do so. In every major crisis, Britain and France were unwilling to commit forces, rendering the military option effectively unavailable. |
| Unanimous voting in the Assembly | All Assembly decisions required unanimity. Any single member could block a resolution. In practice this made the Assembly slow and indecisive, since even minor states could exercise a veto over collective action. |
| Council veto | Each of the four permanent Council members — Britain, France, Italy, Japan — could veto any Council decision. This was a separate structural weakness from the Assembly unanimity rule. If a permanent member was itself the aggressor (as Italy was in Abyssinia), it could simply veto sanctions against itself. |
| Slow decision-making | The League's bureaucratic structure meant responses to crises were painfully slow. The Lytton Commission, sent to investigate Japan's invasion of Manchuria in 1931, did not report until October 1932 — a full year after the invasion. By then Japan had already consolidated control of the region. |
Section 4
Examiner Warnings
These errors appear repeatedly in Cambridge examiner reports for KQ2 structure questions.
Examiner Warnings — KQ2: League Structure
Cambridge 0470 ER 2021–2025-
Collective security was not an automatic military alliance. The Covenant set out a sequence — moral condemnation, then economic sanctions, then military force as a last resort. Military action was never automatic and always required voluntary contributions from members who had no obligation to fight.
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The USA's absence meant sanctions could never be fully effective. It is not enough to say 'the USA wasn't a member'. Examiners want the consequence: aggressors could keep trading with the world's largest economy, so economic pressure was always incomplete. Name this specifically when writing about sanctions failing in Manchuria or Abyssinia.
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The Assembly veto and Council veto are two separate structural weaknesses. Many candidates write vaguely about 'slow decision-making' and treat both as the same point. They are not. The Assembly required unanimity among all members; the Council required unanimous agreement among its permanent members. Both must be named and explained separately to score the point.
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Structure questions should not drift into Manchuria or Abyssinia unless the question covers the 1930s. A question asking about the League's structure is asking about the design of the institution, not its record. Use the crises as brief illustrations of how weaknesses played out — do not turn a structure answer into a narrative of 1930s failures.
Section 5
Exam Focus
Cambridge tests the League's structure across all three question types. Know what each part demands before you start writing.
What / Describe questions
- ✦ Describe the work of the Assembly.
- ✦ What was the role of the Council?
- ✦ What was collective security?
- ✦ What was the Permanent Court of International Justice?
Two clear factual points with specific detail. No analysis required — but vague answers ('the Council was important') score 1–2 only.
Why / Explain questions
- ✦ Why did the League struggle to deal with disputes?
- ✦ Why was the absence of the USA so important?
- ✦ Why was collective security difficult to enforce?
Two developed reasons, each explained and supported with specific evidence. WHY, not WHAT.
How far / Judgement questions
- ✦ Was it the structure or the behaviour of members that caused the League to fail?
- ✦ How far was the League's failure inevitable given its structure?
Both sides explained with specific evidence + a clear supported judgement on 'how far'. L5 requires a verdict in the conclusion.
The Key Analytical Move Cambridge Rewards
The sophisticated answer does not just list the structural weaknesses — it explains why those weaknesses caused more damage in the 1930s than the 1920s.
The structure was always in place. The unanimity rule existed in 1921 as much as in 1935. The League had no army in the 1920s either. What changed was context: the Great Depression pushed member states towards economic nationalism and away from international cooperation; the rise of aggressive dictators raised the cost of enforcement; and Britain and France faced their own military and economic constraints.
The top-level argument is: structural weaknesses + member self-interest at a moment of global crisis = collapse. Neither cause alone is sufficient for a Level 5 judgement.