WILPF developed out of the International Women's Congress against World War I that took place in The Hague, Netherlands, in 1915 and the formation of the International Women's Committee of Permanent Peace; the name WILPF was not chosen until 1919. The first WILPF president, Jane Addams, had previously founded the Woman's Peace Party in the United States, in January 1915, this group later became the US section of WILPF. Along with Jane Addams, Marian Cripps and Margaret E. Dungan were also founding members. The British Maude Royden remained vice president of the international WILPF. As of 1920 the US section of WILPF was headquartered in New York City. Marian Cripps, Baroness Parmoor, who later served as president of its British branch.