Why the League of Nations Failed

On 30 June 1936, Emperor Haile Selassie of Ethiopia stood before the Assembly of the League of Nations in Geneva. His country had just been conquered by Fascist Italy, whose forces had used poison gas against his soldiers and civilians. He had come to ask the world’s first international peace organisation for the help it had promised every member. He received sympathy and very little else. Before leaving the stage, he warned the delegates: “God and history will remember your judgment.”

Within three years, Europe was at war again. The League of Nations, created in 1920 to make sure the horrors of the First World War never returned, had failed in its central purpose. Its collapse was not the result of a single mistake. Weak design, absent great powers, self-interest and a series of crises in the 1930s combined to empty it of authority long before the guns of 1939.

A Dream Born From the Ruins of War

The First World War killed millions of soldiers and civilians and destroyed four empires. Many leaders came to believe that the old system of secret alliances and balance of power had dragged Europe into catastrophe. Something new was needed.

The strongest voice for that new system was United States President Woodrow Wilson. The last of his Fourteen Points, presented in January 1918, called for a general association of nations to guarantee the independence and territory of large and small states alike. At the Paris Peace Conference, Wilson insisted that the Covenant of the League be written into the peace treaties themselves.

The Covenant came into force on 10 January 1920, together with the Treaty of Versailles. The League’s Council first met on 16 January 1920 in Paris, and its first Assembly opened in Geneva on 15 November 1920, with 42 member states.

How the League Was Supposed to Work

The League rested on a simple idea known as collective security. An attack on one member would be treated as a concern for all. Instead of fighting, states would bring disputes to the League for discussion, arbitration or judgment.

Its main bodies were:

• The Assembly, where every member had one vote and met once a year.

• The Council, a smaller group led by the great powers, which met more often and handled crises.

• The Secretariat, the permanent staff in Geneva, led first by Secretary-General Sir Eric Drummond.

• The Permanent Court of International Justice in The Hague, which settled legal disputes between states.

• Agencies such as the International Labour Organization and the Health Organisation, which dealt with workers’ rights, disease, refugees and other social problems.

If persuasion failed, the Covenant allowed members to apply pressure in stages: moral condemnation, then economic sanctions under Article 16, and in theory, military action by member states. That final step, as events would show, depended entirely on the willingness of the great powers.

The Empty Chair: America Walks Away

The League’s first and perhaps greatest blow came from the country that had proposed it. In the United States, many senators feared that membership would drag the country into foreign wars without the approval of Congress. Republicans led by Henry Cabot Lodge demanded reservations to protect American independence of action. Wilson refused to accept them and toured the country to rally public support, until a stroke in October 1919 left him seriously ill.

The Senate failed to ratify the treaty. In the final vote on 19 March 1920, the result was 49 to 35, short of the two-thirds majority required. The United States never joined the League.

The consequences were serious. The world’s largest economy would not take part in League sanctions, which meant any country facing a League embargo could still trade with America. Britain and France, both exhausted and in debt after the war, were left to lead the organisation alone.

A Club With Missing Members

The United States was not the only absent power. The League began as a body dominated by the victors of the First World War.

• Germany was excluded at first and admitted only on 8 September 1926. It left in 1933, months after Hitler came to power.

• The Soviet Union joined only in September 1934 and was expelled in December 1939 after invading Finland.

• Japan left in 1933 after its invasion of Manchuria was condemned.

• Italy left in December 1937 after its conquest of Ethiopia.

Membership reached its peak of 58 states between September 1934 and February 1935. At no point were all the world’s great powers members at the same time. An organisation built on collective action could not act collectively when key players stood outside it, and those who remained often had their own empires and interests to protect.

Built-In Weaknesses

Even with full membership, the League faced deep structural problems.

• No army of its own. The League had no armed force. It depended on members, mainly Britain and France, to enforce its decisions, and they were often unwilling.

• The unanimity rule. Most decisions of the Council and Assembly required every member to agree. A single state, including the one accused of aggression, could slow or block action.

• Weak sanctions. Economic pressure only works if all major trading nations take part. With the United States outside, sanctions had holes from the start.

• Slow procedures. Investigations and reports could take many months, while armies moved in days.

• Linked to Versailles. Because the Covenant formed part of the peace treaties, many Germans saw the League as a club designed to enforce an unjust settlement.

Early Successes in the 1920s

The League was not a failure from the start. In its first decade it settled several disputes and achieved real progress in humanitarian work.

• The Åland Islands (1921): Sweden and Finland both claimed these islands in the Baltic Sea. The League ruled in June 1921 that they would remain Finnish, with protection for the Swedish-speaking population and a ban on fortifications. Both sides accepted the decision.

• Upper Silesia (1921): After a disputed plebiscite between Germany and Poland, the League helped divide the industrial region. A convention signed in Geneva in 1922 kept the peace there until the Second World War.

• Greece and Bulgaria (1925): After a border incident, Greek troops entered Bulgaria. The League condemned the invasion and ordered Greece to withdraw and pay compensation, and Greece complied.

• Mosul (1925): The League awarded the oil-rich Mosul region to Iraq, then under British mandate, rather than to Turkey.

• Refugees: Under the Norwegian explorer Fridtjof Nansen, the League introduced the Nansen passport in 1922, the first internationally recognised identity document for stateless refugees. Hundreds of thousands of former prisoners of war were also returned home.

• Health: The Health Organisation worked against leprosy, malaria and yellow fever and helped prevent typhus epidemics.

These successes shared a pattern. They involved smaller states, and the great powers either supported the League or had little at stake. When a great power itself was the aggressor, the outcome was very different.

Warning Signs: Vilna and Corfu

Two early cases revealed the League’s limits.

Vilna (1920 to 1922): In October 1920, Polish forces under General Lucjan ?eligowski seized the city of Vilna, which had been assigned to Lithuania. The League proposed a plebiscite, then abandoned the plan in March 1921. Poland formally annexed the area in 1922. The League had been ignored, and nothing followed.

Corfu (1923): When an Italian general and his team were murdered while mapping the Greek-Albanian border, Italy’s new leader Benito Mussolini demanded compensation from Greece and occupied the Greek island of Corfu on 31 August 1923. Greece appealed to the League. The final settlement, however, was made by the Conference of Ambassadors, a body of the wartime Allies, and Greece was forced to pay Italy 50 million lire. Mussolini learned that a great power could bully a smaller state and face little punishment.

The Great Depression Changes the World

The Wall Street Crash of 1929 and the Great Depression that followed transformed international politics. Trade collapsed and unemployment soared. Governments turned inward, focusing on their own economies rather than on distant disputes.

The Depression also strengthened nationalist and militarist movements in Germany, Italy and Japan. Leaders in these countries looked to expansion and conquest as answers to economic crisis. At the very moment the League needed strong, united members, its leading powers were weakened and distracted.

Manchuria: The First Great Test

On 18 September 1931, an explosion damaged a section of a Japanese-owned railway near Mukden in Manchuria, northeastern China. Japanese officers of the Kwantung Army had staged the blast themselves. They blamed Chinese forces and used the incident as a pretext to occupy the whole of Manchuria. In March 1932, Japan created a puppet state called Manchukuo, with the former Chinese emperor Puyi as its head.

China appealed to the League. Instead of acting quickly, the League sent a commission of inquiry under the British politician Lord Lytton. The commission did not arrive in Asia until early 1932, and its report was published on 2 October 1932, more than a year after the invasion. The Lytton Report found that Japan’s actions were not self-defence and that Manchukuo was a product of Japanese military aggression.

On 24 February 1933, the League Assembly adopted the report by 42 votes to 1, with only Japan voting against. The Japanese delegation, led by Y?suke Matsuoka, walked out of the hall. On 27 March 1933, Japan gave formal notice that it was leaving the League.

No sanctions were imposed, and no state was prepared to send forces to Asia. Japan kept Manchuria. For the first time, a great power had invaded the territory of another member, defied the League openly and paid no real price.

Disarmament Collapses

The Covenant called on members to reduce their weapons. After years of preparation, the World Disarmament Conference opened in Geneva in February 1932. Germany demanded equal treatment, arguing that if it was not allowed to rearm, others should disarm to its level. France, fearing German power, refused to reduce its forces.

In October 1933, Hitler’s Germany withdrew from both the conference and the League. The conference continued for a time without result. In March 1935, Germany openly rejected the military limits of the Treaty of Versailles. The League’s hope of a disarmed world was finished.

Abyssinia: The Final Blow

The crisis that destroyed the League’s credibility came in Africa. Ethiopia, then often called Abyssinia, was one of the few African states that remained independent, and it was a member of the League. Mussolini wanted to build an Italian empire and to avenge Italy’s defeat by Ethiopia at Adwa in 1896.

On 3 October 1935, Italian forces invaded Ethiopia without a declaration of war. This time the League acted faster. Italy was declared the aggressor, and on 18 November 1935, economic sanctions approved by 50 member states came into effect.

The sanctions, however, had fatal gaps:

• They did not include oil, coal or steel, the very materials Italy needed most to wage war.

• Britain did not close the Suez Canal, the route Italian troops and supplies used to reach East Africa.

• The United States, outside the League, continued to trade with Italy.

Britain and France feared that tougher measures would push Mussolini into an alliance with Hitler. In December 1935, British Foreign Secretary Samuel Hoare and French Prime Minister Pierre Laval secretly agreed on a plan to give Italy large parts of Ethiopia. When details of the Hoare-Laval Pact leaked to the French press on 13 December, public outrage forced Hoare to resign, and the plan collapsed. The damage was done. The two leading members of the League had been caught trying to reward the aggressor.

Meanwhile, Italian forces used chemical weapons, dropping hundreds of tons of poison gas in violation of the 1925 Geneva Protocol. Addis Ababa fell on 5 May 1936, and Mussolini announced the annexation of Ethiopia days later. Haile Selassie went into exile and made his appeal at Geneva on 30 June. Four days later, on 4 July 1936, the League lifted its sanctions. Italy left the League in December 1937.

The Road to War

After Abyssinia, few governments took the League seriously as a guarantee of their security.

While the world watched Ethiopia, Hitler sent troops into the demilitarised Rhineland in March 1936. Britain and France responded through diplomacy rather than League action. The Spanish Civil War, Germany’s annexation of Austria in March 1938 and the Munich Agreement of September 1938 were all handled outside the League. Major decisions about Europe’s future were now made by the great powers directly, and the League was left on the sidelines.

Its last significant act was the expulsion of the Soviet Union on 14 December 1939, after the Soviet invasion of Finland. By then, the Second World War had already begun.

Separating Myth from Fact

• Myth: The League achieved nothing.
  It settled several disputes in the 1920s, helped hundreds of thousands of refugees and prisoners of war, and pioneered international work on health and labour.

• Myth: The League failed because of one crisis.
  Its failure built up over time, from American absence and design flaws to the Depression and repeated surrenders to aggressors.

• Myth: The League itself chose not to act.
  The League could only do what its members agreed to do. The real decisions lay with governments in London, Paris and other capitals, which repeatedly placed national interest above collective security.

Why It Failed: The Core Reasons

• The absence of the United States and the late or partial membership of Germany and the Soviet Union.

• No military force and total dependence on Britain and France for enforcement.

• The unanimity rule and slow procedures that allowed aggressors to act faster than the League could respond.

• Weak and incomplete sanctions, as shown in Abyssinia.

• Its link to the Treaty of Versailles, which made it look like a tool of the victors.

• The Great Depression, which turned governments inward and strengthened aggressive regimes.

• The self-interest of the great powers, whose fear of war and concern for their own empires led them to appease rather than confront.

From Geneva to New York

The League held its final Assembly in April 1946 and formally ceased operations on 18 April 1946. Its buildings, archives and several of its agencies passed to the new United Nations. The Permanent Court of International Justice became the International Court of Justice, the Health Organisation evolved into the World Health Organization, and the International Labour Organization continued its work under the United Nations.

The founders of the United Nations studied the League’s mistakes closely. They gave the great powers permanent seats on a Security Council with the power to authorise military action, and they made sure the United States and the Soviet Union were members from the beginning. The new body had its own weaknesses, including the veto, but its design reflected the hard lessons of Geneva.

The League of Nations was the world’s first serious attempt to replace war with law and cooperation. It failed because the nations that created it were not willing to defend it when the test came. Haile Selassie’s warning in 1936 was directed at the delegates in the hall, and within a few years, many of their own countries were under attack.

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