The League of Nations has been created after the First World War, in 1919, to avoid a repeat of a devastating war. It was the first permanent international organisation whose principal mission was to maintain world peace.
In spite of some early successes in the 1920s, the League of Nations did not manage to prevent either the invasion of Manchuria by Japan in 1931, or the annexation of Ethiopia by Italy in 1936, nor that of Austria by Germany in 1938. The powerlessness of the League of Nations to prevent further world conflict, the alienation of part of its Member States and the generation of the war itself, added to its demise in 1940.
The United Nations replaced it after the end of World War II and inherited a number of agencies and organisations founded by the League.
341.121: League of Nations