Failure of the League of Nations: The League was doomed from the start, and failed in many aspects over the years, not just negotiations. (In this way, the League counts as both a long term and short term cause.) In terms of negotiations, the League screwed up on a few accounts; first, it often pursued a policy of appeasement, which only further prompted aggressor nations into expanding territory, since they became convinced no one would stop them, and they also failed to protect other nations from the aggression of the aggressor nations. In this way, many countries that thought they were safe from aggressor nations, were actually often powerless to stop Germany and Italy from invading.