After the first World War, the victors assembled a peace conference outside of Paris, France in January, 1919. While there were representatives from over 30 groups, the conference was dominated by the interests of the "Big Four:" France, Great Britain, United States and Italy. In support of the Balfour Declaration of 1918 by the British Foreign Secretary, Chaim Weizmann (1874-1952) led the Zionist Delegation. After the second Word War, he was a major party in the founding of Israel.
The Treaty of Versailles also organized the League of Nations, a precursor to the United Nations founded in 1947. More isolationist factions in the United States persuaded the government to not sign the Treaty of Versailles. Instead the US signed an independent Treaty of Berlin which left out the League of Nations. See history.state.gov for more information.