What was the League of Nations?

The League of Nations was the first permanent international organization created to keep peace and resolve disputes between countries through diplomacy rather than war. It was established by the Treaty of Versailles in 1919 and began operating on January 10, 1920, with headquarters in Geneva, Switzerland. The League was the brainchild of President Woodrow Wilson, who outlined the idea in the fourteenth point of his Fourteen Points speech to Congress on January 8, 1918. Wilson argued that the secret alliances and arms races of the prewar years had made world war inevitable, and that a public forum for collective security would prevent another catastrophe.

The League's main organs were the Assembly, where every member state had one vote, the Council of permanent and rotating great powers, and a Secretariat of international civil servants. Member states pledged to submit disputes to arbitration, to cooperate against aggressors, and to reduce armaments. The League had 42 founding members in 1920 and reached a peak of 58 members in 1934.

Despite Wilson's leadership, the United States never joined. The Senate, led by Republican Henry Cabot Lodge, rejected the Treaty of Versailles in November 1919 and again in March 1920, fearing that Article 10 of the League Covenant would commit the country to foreign wars without congressional consent. Wilson suffered a stroke during a national tour to rally public support and never recovered politically.

The League had real successes, including resolving border disputes between Sweden and Finland over the Aland Islands in 1921 and between Greece and Bulgaria in 1925, supervising mandates such as Iraq and Palestine, and running humanitarian programs for refugees and labor rights through the International Labour Organization. It failed against larger threats. Japan invaded Manchuria in 1931 and walked out when condemned. Italy invaded Ethiopia in 1935 and faced only weak sanctions before withdrawing from the League in 1937. Germany under Adolf Hitler quit in October 1933 and rearmed openly.

By the late 1930s the League had lost almost all credibility. After World War II broke out, the organization was effectively dissolved, and the United Nations was founded in 1945 as a successor designed to avoid the League's weaknesses, including American membership and a Security Council with enforcement power.