Excerpts from Books and Wikipedia
"The refusal of the U.S.A. to join the League of Nations deprived it of any real meaning." [Hobsbawm: Extremes, p. 34] "Because of the failure of its leading members to halt Mussolini’s aggression in 1935–1936, the League was now pretty much discredited; it played little or no role, for example, either in the Spanish Civil War or in Japan’s open assault upon China in 1937." [Kennedy: Great Powers, p. 336]