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North Atlantic Treaty Organization
Organisation du traité de l'Atlantique nord
NATO OTAN landscape logo.svg
Logo
Flag of NATO.svg
North Atlantic Treaty Organization (orthographic projection).svg
Member states of NATO
AbbreviationNATO, OTAN
MottoAnimus in consulendo liber
Formation4 April 1949
TypeMilitary alliance
HeadquartersBrussels, Belgium
Membership
Official language
Jens Stoltenberg
Air Chief Marshal Stuart Peach, Royal Air Force
General Tod D. Wolters, United States Air Force
Général André Lanata, French Air Force
Expenses (2018)US$1.0 trillion
WebsiteNATO.int

The North Atlantic Treaty Organization (NATO /ˈnt/; French: Organisation du traité de l'Atlantique nord; OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance between 29 North American and European countries. The organization implements the North Atlantic Treaty that was signed on 4 April 1949. NATO constitutes a system of collective defence whereby its independent member states agree to mutual defence in response to an attack by any external party. NATO's Headquarters are located in Haren, Brussels, Belgium, while the headquarters of Allied Command Operations is near Mons, Belgium.

Since its founding, the admission of new member states has increased the alliance from the original 12 countries to 29. The most recent member state to be added to NATO is Montenegro on 5 June 2017. NATO currently recognizes Bosnia and Herzegovina, Georgia, North Macedonia and Ukraine as aspiring members. An additional 21 countries participate in NATO's Partnership for Peace program, with 15 other countries involved in institutionalized dialogue programs. The combined military spending of all NATO members constitutes over 70% of the global total. Members have committed to reach or maintain defense spending of at least 2% of GDP by 2024.

History

On 4 March 1947 the Treaty of Dunkirk was signed by France and the United Kingdom as a Treaty of Alliance and Mutual Assistance in the event of a possible attack by Germany or the Soviet Union in the aftermath of World War II. In 1948, this alliance was expanded to include the Benelux countries, in the form of the Western Union, also referred to as the Brussels Treaty Organization (BTO), established by the Treaty of Brussels. Talks for a new military alliance which could also include North America resulted in the signature of the North Atlantic Treaty on 4 April 1949 by the member states of the Western Union plus the United States, Canada, Portugal, Italy, Norway, Denmark and Iceland.

A long rectangular room with multiple rows of seated individuals on each side, and flags hanging at the far end.