members and established..

NATO (North Atlantic Treaty Organization) is an international military alliance that consists of 30 member states from Europe and North America. It was established at the signing of the North Atlantic Treaty on 4 April 1949. Article 5 of the treaty states that if an armed attack occurs against one of the member states, it shall be considered an attack against all members, and other members shall assist the attacked member, with armed forces if necessary. Article 6 of the treaty limits the scope of Article 5 to the islands north of the Tropic of Cancer, the North American and European mainlands, the entirety of Turkey, and French Algeria. As such, an attack on Hawaii, Puerto Rico, French Guiana, Ceuta, or Melilla, among other places, would not trigger an Article 5 response.
Of the 30 member countries, 28 are in Europe and two in North America. Between 1994 and 1997, wider forums for regional cooperation between NATO and its neighbours were set up, including the Partnership for Peace, the Mediterranean Dialogue initiative and the Euro-Atlantic Partnership Council.
All members have militaries, except for Iceland, which does not have a typical army (but it does have a coast guard and a small unit of civilian specialists for NATO operations). Three of NATO's members are nuclear weapons states: France, the United Kingdom, and the United States. NATO has 12 original founding member states. Three more members joined between 1952 and 1955, and a fourth new member joined in 1982. After the end of the Cold War, NATO added 14 more members from 1999 to 2020.

NATO currently recognizes Bosnia and Herzegovina, Finland, Georgia, Sweden, and Ukraine as aspiring members as part of their Open Doors enlargement policy.

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