The motivation behind establishing the League of Nations after World War I was to promote international cooperation and prevent future conflicts. Leaders sought to address the devastation caused by the war and avert another large-scale tragedy. Key figures like U.S. President Woodrow Wilson advocated for the League as part of his Fourteen Points, emphasizing collective security, disarmament, and diplomatic negotiations. The League aimed to facilitate discussion among nations, manage disputes peacefully, and work towards global stability. However, it faced challenges, including the absence of major powers like the United States, leading to its eventual ineffectiveness and dissolution in the lead-up to World War II.