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Establishment

At the Paris Peace Conference in 1919, Wilson, Cecil and Smuts all put forward their draft proposals. After lengthy negotiations between the delegates, the Hurst – Miller draft was finally produced as a basis for the Covenant. After more negotiation and compromise, the delegates finally approved of the proposal to create the League of Nations (French: Société des Nations, German: Völkerbund) on 25 January 1919. The final Covenant of the League of Nations was drafted by a special commission, and the League was established by Part I of the Treaty of Versailles, signed on 28 June 1919.

French women's rights advocates invited international feminists to participate in a parallel conference to the Paris Conference in hopes that they could gain permission to participate in the official conference. The Inter-Allied Women's Conference asked to be allowed to submit suggestions to the peace negotiations and commissions and were granted the right to sit on commissions dealing specifically with women and children. Though they asked for enfranchisement and full legal protection under the law equal with men, those rights were ignored. Women won the right to serve in all capacities, including as staff or delegates in the League of Nations organization. They also won a declaration that member nations should prevent trafficking of women and children and should equally support humane conditions for children, women and men labourers. At the Zürich Peace Conference held between 17 and 19 May 1919, the women of the WILPF condemned the terms of the Treaty of Versailles for both its punitive measures, as well as its failure to provide for condemnation of violence and exclusion of women from civil and political participation. Upon reading the Rules of Procedure for the League of Nations, Catherine Marshall, a British suffragist, discovered that the guidelines were completely undemocratic and they were modified based on her suggestion.

The League would be made up of a General Assembly (representing all member states), an Executive Council (with membership limited to major powers), and a permanent secretariat. Member states were expected to "respect and preserve as against external aggression" the territorial integrity of other members and to disarm "to the lowest point consistent with domestic safety." All states were required to submit complaints for arbitration or judicial inquiry before going to war. The Executive Council would create a Permanent Court of International Justice to make judgements on the disputes.

Despite Wilson's efforts to establish and promote the League, for which he was awarded the Nobel Peace Prize in October 1919, the United States never joined. Senate Republicans led by Henry Cabot Lodge wanted a League with the reservation that only Congress could take the U.S. into war. Lodge gained a majority of Senators and Wilson refused to allow a compromise. The Senate voted on the ratification on 19 March 1920, and the 49–35 vote fell short of the needed 2/3 majority.

The League held its first council meeting in Paris on 16 January 1920, six days after the Versailles Treaty and the Covenant of the League of Nations came into force. On 1 November 1920, the headquarters of the League was moved from London to Geneva, where the first General Assembly was held on 15 November 1920. Geneva made sense as an ideal city for the League, since Switzerland had been a neutral country for centuries and was already the headquarters for the International Red Cross. Its strong democracy and location in central Europe made it a good choice for the nations of the world. Support for Geneva as the selection came from Swiss Federal Councillor Gustave Ador and economist William Rappard. The Palais Wilson on Geneva's western lakeshore, named after Woodrow Wilson, was the League's first permanent home.