The primary objective of the interwar International League of Nations, established after World War I in 1920, was to promote peace and cooperation among countries to prevent future conflicts. Formed through the Treaty of Versailles, the League aimed to foster international dialogue and arbitration to address disputes diplomatically, thereby reducing the likelihood of war. It sought to regulate disarmament, improve global welfare, and uphold collective security through mutual defense agreements. Although it failed to prevent the outbreak of World War II and was ultimately deemed ineffective, the League's establishment laid important groundwork for the creation of the United Nations, which sought to fulfill similar objectives more successfully after the war.