The North Atlantic Treaty Organization (NATO); French: Organisation du Traité de l'Atlantique Nord (OTAN); (also called the North Atlantic Alliance, the Atlantic Alliance, or the Western Alliance) is a military alliance established by the signing of the North Atlantic Treaty on 4 April 1949. The NATO headquarters are in Brussels, Belgium, [3] and the organization constitutes a system of collective defence whereby its member states agree to mutual defence in response to an attack by any external party.
Since the September 11, 2001 "terrorist" attacks, NATO has attempted to refocus itself to new challenges and has deployed troops to Afghanistan and trainers to Iraq.
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