The document discusses why the United States did not join the League of Nations after World War I. Henry Cabot Lodge and other Republicans opposed U.S. membership due to concerns that Article X of the League charter would require the U.S. to take military action according to the League's decisions without regard for American interests. While Woodrow Wilson strongly advocated for the League and American involvement after winning the 1919 Nobel Peace Prize, the Republican-controlled Senate refused to ratify the Treaty of Versailles that established the League. As a result, the U.S. remained outside of the League when it began operations after World War I.