On January 25th 1919, the League of Nations, the forerunner to the United Nations, was formed. The league was formed out of the reconciliation process of World War I at the Paris Peace Conference in 1919. The use of such a league marked a significant departure from the inter-national relations of the previous 100 years, trading military force for peaceful diplomacy in order to fulfill goals like disarmament and peaceful international relations.
The League was largely successful during the 1920s, especially in the face of a socialist Weimar Germany. However, the rise of the Nazi party and Mussolini during the 1930s began to unveil failings in the diplomatic basis of the League of Nations. The ultimate outbreak of World War II saw the dismantling of the League, later replaced after the war by the United Nations which has existed until today.