The primary purpose of the League of Nations, established after World War I, was to promote international cooperation and prevent future conflicts. Founded in 1920 as part of the Treaty of Versailles, the League aimed to provide a platform for resolving international disputes through diplomacy rather than warfare. It sought to address issues such as disarmament, collective security, and sustainable peace among nations. Although the League had some successes in mediation, it struggled with enforcement and membership, lacking participation from major powers, including the United States. Ultimately, the League's failures to prevent aggression in the 1930s highlighted its limitations, influencing the formation of the United Nations after World War II.