Although Woodrow Wilson is usually given the credit and the blame for the failed League of Nations, it was actually an idea that had been around for awhile. The philosopher Immanuel Kant had written of a philosophically based but similar idea years before the First World War, and other politicians and idealists had tossed around similar ideas as well. Woodrow Wilson's idea for a League of Nations, however, was presented as a way to end international conflict and warfare forever, arguably a pleasant, but unrealistic idea. In his address commonly called the "League of Nations Speech" of 1919, among other things, Wilson said:
It is a definite guaranty of peace. It is a definite guaranty by word against aggression. It is a definite guaranty against the things which have just come near bringing the whole structure of civilization into ruin.
Unfortunately, it did not wind up being a "guaranty" of anything, because there was a certain world clientele that did not want to abide by the rules; therefore, the League ultimately failed because there were plenty of international parties that did not want to play the game, chief among them one gentleman named Adolf Hitler. Efforts to pacify Hitler were met with a 1939 invasion of Poland, and eventually, World War II.