The League of Nations was an international peacekeeping organization created after World War I.

It was the brainchild of U.S. President Woodrow Wilson, and its creation was a key part of his 'Fourteen Points' peace plan.

The League's primary goal was to prevent future wars through collective security, disarmament, and settling international disputes through negotiation.

It was formally established by the Treaty of Versailles in 1919.

The League was handicapped from the start by the absence of major world powers.

Crucially, the United States never joined the League, as the U.S. Senate refused to ratify the Treaty of Versailles.

Germany and the Soviet Union were initially excluded from joining.

The League had some successes in settling minor international disputes in the 1920s.

However, it lacked its own military force and had no power to compel its members to follow its resolutions.

The League ultimately failed to prevent the aggression of the Axis powers in the 1930s, such as the Japanese invasion of Manchuria and the Italian invasion of Ethiopia, and it was dissolved after World War II.