League of Nations Founded

Setting the scene

The League of Nations was founded on January 10, 1920, as part of the Treaty of Versailles, fulfilling Woodrow Wilson's Fourteenth Point calling for a 'general association of nations.' The League was the first worldwide intergovernmental organization dedicated to maintaining peace, preventing war through collective security, disarmament, and settling disputes through negotiation and arbitration. Its Covenant was drafted at the Paris Peace Conference in 1919, and the League was headquartered in Geneva, Switzerland.

What happened

The League had 42 founding members, eventually growing to 58, but the United States never joined—despite Wilson's advocacy, the Senate rejected the Treaty of Versailles in 1920, fearing entanglement in European affairs. The League's structure included an Assembly (all members), a Council (great powers), and a Permanent Court of International Justice. It achieved successes in the 1920s: resolving border disputes, repatriating prisoners of war, combating disease, and administering mandates over former German and Ottoman territories.

Why it still matters

The League failed to prevent World War II due to structural weaknesses: lack of U.S. participation, requirement for unanimous decisions, no standing army, and inability to enforce decisions against great powers. It failed to stop Japanese aggression in Manchuria (1931), Italian invasion of Ethiopia (1935), and German rearmament. The League was dissolved in 1946 and replaced by the United Nations. Though it failed, the League established the principle of international organization for peace, created technical agencies that became UN specialized agencies, and provided lessons for the UN's design.

Background

The US never joined, limiting its clout.