Quick-fire overview:

• The League was born from Woodrow Wilson's 14 Points speech (Jan 1918) and officially opened on 10th January 1920.
• Its aims: solve disputes peacefully, achieve world disarmament, encourage free trade, and improve living standards.
• The USA never joined — a fatal blow to its authority and military credibility from day one.
• In the 1920s, it had some genuine peacekeeping successes (Aaland Islands) but also embarrassing failures (Vilna, Corfu) when powerful countries were involved.
• Its humanitarian commissions (Refugees, Health, ILO, Slavery) were consistently its strongest area of work.
• The Wall Street Crash (1929) and Great Depression fuelled extremism and militarism worldwide, undermining the League's entire purpose.
• The League's failure to stop Japan in Manchuria (1931–33) and Italy in Abyssinia (1935–36) destroyed its credibility for good.
• It formally dissolved in April 1946, handing its powers to the newly created United Nations.

To understand the League, you first need to understand the sheer scale of the trauma that created it. World War One (1914–1918) killed around 8.5 million soldiers and 13 million civilians — a death toll made horrifying by brand-new technology (machine guns, chemical weapons, artillery) being used with old-fashioned battle tactics. After that kind of catastrophe, world leaders genuinely wanted to find a way to stop it ever happening again.

Think of it like this: imagine a school where two kids get into a massive, destructive fight that wrecks the whole classroom. Afterwards, the head teacher doesn't just punish the two kids — they set up a "peace committee" so that next time two students disagree, there's a proper system to sort it out before it turns into a fight. That's essentially what the League of Nations was meant to be for countries.

Woodrow Wilson and the 14 Points

US President Woodrow Wilson gave a speech to Congress on 8th January 1918 called the "14 Points," laying out his vision for the post-war world. Key points included:

• Self-determination — every national group should get its own country
• Disarmament — countries should reduce weapons to avoid future war
• Countries should discuss issues openly, not sign secret treaties
• Countries should remove trade tariffs and cooperate economically

The headline point — and the one Wilson cared about most — was the creation of the League of Nations itself.

At the Paris Peace Conference (1919), Wilson was one of the "Big Three" (alongside Lloyd George of Britain and Clemenceau of France) who pushed for the League's creation. It was written into the Covenant, and all five Versailles Settlement treaties legalised it.

Wilson wanted every nation on Earth to be a League member, working together for global good. Reality fell far short of that vision.

This left Britain and France as the League's most powerful members by default. But neither was especially committed:

• Both had been weakened by WWI and had other priorities (France: fear of Germany; Britain: managing its Empire)
• They frequently avoided using the League, preferring their own diplomacy
• Their half-hearted commitment made the League look weak without the USA's backing

Why exactly did the USA stay out?

• US politicians were isolationists — they believed the League would drag America into future European wars
• Americans didn't want more casualties like WWI, and many were anti-imperialist (against maintaining empires, which the League's mandate system supported)
• Some Americans had German ancestry and felt sympathy for Germany after the harsh Treaty of Versailles
• US businesses feared League sanctions could damage their ability to export goods
• Wilson became too ill to campaign effectively (a stroke after his 27-day train tour)
• Republican Warren Harding campaigned aggressively against the League and won the 1921 election

The League was made up of four main bodies. Contemporary critics argued the structure itself was the League's biggest weakness — it just wasn't built to act quickly or decisively.

• Absence of the USA weakened the League fundamentally — the USA could ignore any sanctions or military decisions the Council made
• World leaders disagreed about what the League should even be:
  • Wilson: wanted it to work like an international parliament, prioritising world issues over national ones
  • Lloyd George (Britain): wanted it to only meet in emergencies, and to help Britain expand its empire via mandates
  • Clemenceau (France): wanted it to protect France from invasion and maintain a large army

Here's a subtle but important point: the 1920s actually saw a lot of successful diplomacy — but most of it happened outside the League's official channels, negotiated directly between countries. This tells us something crucial: even when things were going well, countries didn't trust the League enough to use it as the main forum. That's a bad sign for what would happen when things got difficult in the 1930s.

Article 10 of the League's Covenant promised "collective security" — the idea that an attack on one member was an attack on all members, who would then unite to defend the victim (potentially with a combined League army). This was the League's central promise. Its actual track record was very mixed — here are five key case studies, worth learning as a set because exam questions often ask you to compare them.

Here's the thing most students underrate: the League's peacekeeping record was patchy, but its humanitarian record was genuinely impressive. This is a crucial "balance" point for any essay about the League's success — even if it failed at its headline job (stopping wars), it succeeded quietly at improving millions of ordinary lives.

During the 1920s, the USA's economy boomed — partly because Britain and France were repaying wartime loans. Stockbrokers speculated so heavily that by October 1929, share prices began collapsing. The worst day, "Black Thursday" (24th Oct 1929), saw 13 million shares sold in panic. By 30th October, investors had lost $4 billion. This is called the "Wall Street Crash" because Wall Street in New York is home to the US Stock Exchange.

Why did this cause a WORLDWIDE depression?

• The Dawes and Young Plans had tied the German economy directly to US loans — when the US recalled those loans to save itself, Germany's economy collapsed too
• Trade slowed globally — governments raised trade tariffs and told citizens to "buy domestic," which damaged worldwide economies even further

When people are desperate and unemployed, they turn against their governments and look for radical alternatives. Fascism and Communism both surged in popularity during the Depression — the Nazi Party's vote share jumped +40% by 1932. By 1939, Europe had four major dictators: Mussolini (Italy, 1922), Stalin (USSR, 1924), Hitler (Germany, 1934), and Franco (Spain, 1939).

Extremist leaders cared only about their own country, adopted aggressive foreign policies, and had zero respect for the League. Even non-extremist democratic leaders started prioritising their own nation's protection over their duties to the League.

Militarism as an "answer" to the Depression

Rearmament created jobs and restored national pride — but it directly contradicted the League's core aim of disarmament.

Germany's rearmament by the numbers: unemployment fell from 4.8 million (1933) to just 300,000 (1939) as rearmament created millions of jobs. Its army grew from 7 fully trained divisions (1933) to 52 (1939); it built a Luftwaffe of over 4,000 planes from scratch, and its navy went from 4 warships to 54 submarines.

Manchuria was a resource-rich, agricultural province of China, bordering Korea (which Japan had owned since 1905). Japan already controlled the South Manchurian Railway and had guards stationed there to protect it — so it had both the excuse and the means to expand further.

Why did Japan invade? (Push & Pull factors)

• Geographical: Japan already controlled key areas in and around Manchuria (the railway, plus Korea next door)
• Economic (push): Japan had suffered badly from the Depression — its silk export market (its biggest export) had crashed, and employment had fallen 30%
• Economic (pull): Manchuria had abundant natural resources and good trade links to Asian markets — exactly what resource-poor Japan needed
• Military: Japan's military was far stronger than China's

• 18 months too slow — by the time the Lytton Report was even discussed, Japan had already fully consolidated its conquest
• Britain and France wouldn't confront Japan — Japan was a permanent Council member with veto power, and both Britain and France had valuable colonies in the Far East they didn't want to risk in a war
• No powerful members to enforce action — the USA had the military strength to intervene but wasn't in the League (and was Japan's key trading partner); the USSR wasn't a member either at this point
• It emboldened other aggressors — Hitler and Mussolini watched closely and learned that the League would not actually stop determined aggression

Running at the exact same time as the Manchuria Crisis, this Geneva conference was meant to get countries to disarm — but Manchuria proved that a strong military (like Japan's) could simply defy the League with no consequences, which discouraged anyone from disarming. Germany's Weimar politicians challenged all countries to disarm to Germany's level; France refused. When Hitler took power in 1933, he offered not to rearm if others destroyed weapons within 5 years — while secretly already rearming Germany. France, Czechoslovakia, and Poland (all bordering Germany) refused his offer out of fear — giving Hitler the perfect excuse to storm out and take Germany out of the League in November 1933. The conference collapsed in total failure in 1934.

Abyssinia (modern-day Ethiopia) was a country in north-east Africa surrounded by British, French, and Italian colonies, but it had managed to stay independent. Italy's dictator Mussolini wanted it badly.

Why did Italy invade? (Push & Pull factors)

• Historical: Mussolini wanted to recreate the glory of the Roman Empire, and to get revenge for Abyssinia's humiliating defeat of Italy back in 1896
• Economic (push): Italy had suffered from the Depression and wanted to grow its own raw materials rather than rely on imports
• Economic (pull): Abyssinia had mineral deposits and fertile farmland
• Geographical: Abyssinia bordered two existing Italian colonies (Italian Somaliland and Eritrea) — an easy target to link together into one empire. Mussolini also correctly bet that Britain and France wouldn't stop him, because they needed Italy as an ally against Nazi Germany

• Sanctions deliberately excluded oil, iron and steel — the exact materials Italy needed to keep fighting — because Britain and France feared pushing Italy too hard would drive it into an alliance with Hitler
• Britain and France didn't even close the Suez Canal, Italy's main sea route to Abyssinia
• The Hoare-Laval Pact exposed that Britain and France cared more about their own diplomatic alliance with Italy (the "Stresa Front" against Germany) than about protecting a League member from invasion
• The USA sold oil to Italy throughout the crisis — proving yet again that League sanctions were useless without US cooperation
• Ultimately, Italy and Germany drew closer together — forming the Rome-Berlin Axis in 1936, the very alliance that would fight WWII