The League of Nations was established after World War I to promote global peace and cooperation but faced significant challenges in the 1920s, including a lack of military force and the absence of major powers like the United States. Despite some successes in dispute resolution and humanitarian efforts, the League ultimately struggled with its effectiveness and authority, facing failures in key incidents such as the Corfu and Vilna disputes. By the end of the decade, the League's weaknesses were exposed, leading to its decline in the 1930s and raising questions about the success of international cooperation efforts that would follow.