History of the United Nations $8.5 million donation from John D. Rockefeller, Jr. The UN headquarters officially opened on January 9, 1951, although construction was not formally completed until October 9, 1952. Under special agreement with the United States, the UN enjoys certain diplomatic privileges and immunities, but generally the laws of New York City, New York State, and the United States apply. While the principal headquarters of the UN remain in New York City, major agencies base themselves in Geneva, The Hague, Vienna, Nairobi and elsewhere. The basic constitutional makeup of the United Nations has changed little, though vastly increased membership has altered the
United Kingdom and the United Nations peace operations and in UN headquarters. United Kingdom and the United Nations The United Kingdom of Great Britain and Northern Ireland is a founding member of the United Nations and one of five permanent members of the UN Security Council. As the fifth largest provider of financial contributions to the United Nations, the UK provided 5 percent of the UN budget in 2015, and 6.7 percent of the peacekeeping budget. British English is one of the six official languages of the United Nations, and the United Kingdom is home to the International Maritime Organization, whose head office is in London.