A League of Nations was created to promote peace. The League of Nations was created in January 1920. The first members were Britain, France, Italy and Japan. The US senate failed to ratify (agree) the treaty. In 1926, Germany joined the League, after a pact in 1925 agreeing the borders between France and Germany and Belgium and Germany. At its greatest size, in 1934-5, the League had 58 members. Picture 1921 Wikipedia.