** Ibero-American Tournament: 1964

** International Air Transport Association for Baker Army Air Field ( abandoned ), Baker Island, United States Minor Outlying Islands

** United States Army Medical Unit ( 1956 – 69 )

** C. v. mexicanus ( Linnaeus, 1766 )-eastern United States west of Atlantic Seaboard to Great Plains

** United States ( January 1, 2009 )

** Canals of the United States

** Commodore ( United States ), in the United States Navy and United States Coast Guard

** United States: see Coptic Orthodox Church in the United States

** Cumberland Road, a historical road, also called the Great National Pike and the National Road, the first United States federal highway

** Democratic Party ( United States )

** Itemized deduction, eligible expense that individual taxpayers in the United States can report on their Federal income tax returns

** Clement of Alexandria ( Episcopal Church in the United States of America )

** Nicholas Ferrar ( Episcopal Church ( United States ))

** United States housing bubble

** USS Harpers Ferry ( LSD-49 ), a Harpers Ferry class dock landing ship of the United States Navy, commissioned in 1995

** Eight players from the 1950 team played for Head Coach John Longfellow as the United States ' Gold Medal Basketball team at the inaugural 1951 Pan-American Games.

** Native Americans in the United States

** Social Security debate ( United States )

** Social Security ( United States )

** Evelyn Underhill ( Church of England and the Episcopal Church of the United States )

** Blessed Kateri Tekakwitha ( United States )

** Camillus de Lellis ( Roman Catholic Church, except in the United States )

** Camillus de Lellis ( optional memorial, United States only )

** The Syntactic Organization of American Sign Language: A Synopsis (. pdf )

** United Nations Educational, Scientific, and Cultural Organization ( UNESCO )

** UN Industrial Development Organization ( UNIDO )

** UN Truce Supervision Organization ( UNTSO )

** Bureau of International Organization Affairs

** Albania officially joins the World Trade Organization.

** The Southeast Asia Treaty Organization is permanently disbanded.

** In 1999, the North Atlantic Treaty Organization ( NATO ) led by the United States launched air attacks against Yugoslavia ( then composed of only Serbia and Montenegro ) to pressure the Yugoslav government to end its military operations against ethnic Albanian separatists in Kosovo due to accusations of war crimes being committed by Yugoslav military forces working alongside nationalist Serb paramilitary groups.

** The World Health Organization declares tuberculosis a Global Emergency.

** Organization for the Prohibition of Chemical Weapons ( OPCW ), CWC treaty enters into force.

** The World Health Organization is established by the United Nations.

** The first World Health Assembly of the World Health Organization is held in Geneva.

** Provisional International Civil Aviation Organization founded as a specialized agency of the United Nations.

** International Labour Organization ( ILO ) In 1945, the organisation's new constitution came into effective.

** Preparatory Commission for the Comprehensive Nuclear Test Ban Organization ( CTBTO ) established.

** The Republic of Angola officially joins the World Trade Organization, as Angola.

** The World Trade Organization ( WTO ) is established to replace the General Agreement on Tariffs and Trade ( GATT ).

** Warsaw Treaty Organization joint secretariat established.

** The International Maritime Organization is inaugurated.

** International Labor Organization ( ILO ) is established as an agency of the League of Nations.

** A report by the World Meteorological Organization reports an unprecedented level of ozone depletion in both the Arctic and Antarctic.

** The National Organization for Women ( NOW ) is founded in Washington, DC.

** The U. N. General Assembly decides to found the United Nations Industrial Development Organization.

** Warsaw Treaty Organization officially dissolved in accordance with a protocol calling for a “ transition to all-European structures.

** The International Hydrographic Organization ( IHO ) is founded.