The balance-of-power system collapsed with the outbreak of World War I because the alliances it spawned had no flexibility, and it was indiscriminately applied to peripheral issues, thereby exacerbating all conflicts. The system of collective security demonstrated the opposite failing when confronted by the initial steps toward World War II. The League of Nations was impotent in the face of the dismemberment of Czechoslovakia, the Italian attack on Abyssinia, the German derogation of the Locarno Treaty, and the Japanese invasion of China. Its definition of aggression was so vague, the
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