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The Treaty of Versailles ended World War I. United States President Woodrow Wilson was a key figure in the peace conference, because his Fourteen Points formed the basis of the negotiations. The Fourteen Points included free trade, open diplomacy, arms reductions, and a League of Nations, an international body intended to be a forum for settling international disputes without war. The final treaty was unpopular with the Republican Senate because it required joining the new League of Nations, which many Senators suspected would take away U.S. rights. In the end, the Senate rejected the Treaty.