On this day, the League of Nations, the international peacekeeping organization formed at the end of World War I, expels the Union of Soviet Socialist Republics in response to the Soviets' invasion of Finland on October 30.
Although the League of Nations was more or less the brainchild of President Woodrow Wilson, the United States, which was to have sat on the Executive Council, never joined. Isolationists in the Senate--put off by America's intervention in World War I, which they felt was more of a European civil war than a true world war--prevented American participation. While the League was born with the exalted mission of preventing another "Great War," it proved ineffectual, being unable to protect China from a Japanese invasion or Ethiopia from an Italian one. The League was also useless in reacting to German remilitarization, which was a violation of the Treaty of Versailles, the document that formally set the peace terms for the end of World War I.
Germany and Japan voluntarily withdrew from the League in 1933, and Italy left in 1937. The true imperial designs of the Soviet Union soon became apparent with its occupation of eastern Poland in September of 1939, ostensibly with the intention of protecting Russian "blood brothers," Ukrainians and Byelorussians, who were supposedly menaced by the Poles. Lithuania, Latvia, and Estonia were then terrorized into signing "mutual assistance" pacts, primarily one-sided agreements that gave the USSR air and naval bases in those countries. But the invasion of Finland, where no provocation or pact could credibly be adduced to justify the aggression, resulted in worldwide reaction. President Roosevelt, although an "ally" of the USSR, condemned the invasion, causing the Soviets to withdraw from the New York World's Fair. And finally, the League of Nations, drawing almost its last breath, expelled it.