NATO is a transatlantic military alliance of thirty-two member states, founded in 1949 to provide collective defence against the Soviet Union and now operating as the world's largest standing security alliance. The treaty's most-cited provision, Article 5, commits member states to treat an armed attack on one as an attack on all.
At a glance
- Founded: 1949 (North Atlantic Treaty signed in usa-state/washington/" data-it-autolink="1">Washington, D.C., on 4 April 1949)
- Headquarters: Brussels, Belgium
- Official languages: English, French
- Website: www.nato.int
Mission
NATO's essential purpose is to safeguard the freedom and security of all its members through political and military means. Political: promoting democratic values and consultation between members. Military: a commitment to peaceful resolution of disputes, with collective defence capability for cases where diplomatic efforts fail.
Structure
The North Atlantic Council is NATO's principal political decision-making body, with a permanent representative from each member. Decisions are taken by consensus — every member has, in effect, a veto. The Secretary General chairs the Council and acts as the alliance's chief spokesperson. Military command is divided between Allied Command Operations (Mons, Belgium) for current operations and Allied Command Transformation (Norfolk, United States) for future capabilities.
Member states
NATO has 32 member states. Membership current as of 2024-03.
- Albania
- Belgium
- Bulgaria
- Canada
- Croatia
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Montenegro
- Netherlands
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Slovakia
- Slovenia
- Spain
- Sweden
- Turkey
- United Kingdom
- United States
Key facts
- Article 5 has been invoked exactly once in NATO's history — by the United States after the September 11 attacks in 2001.
- NATO members commit to spending at least 2% of GDP on defence; meeting the target has historically been uneven, though many members have closed the gap since 2022.
- Iceland is the only NATO member with no standing armed forces; it contributes through coast guard, air policing host duties, and civilian deployments.
- France withdrew from the integrated military command in 1966 and rejoined in 2009.
- Sweden became the 32nd member in March 2024, ending two centuries of Swedish military non-alignment.
Historic milestones
| Year | Event |
|---|---|
| 1949 | North Atlantic Treaty signed by 12 founding members |
| 1955 | West Germany joins; Warsaw Pact formed in response |
| 1990 | East Germany absorbed into the alliance via reunification |
| 1999 | First post-Cold-War expansion: Czech Republic, Hungary, Poland join |
| 2001 | Article 5 invoked after the September 11 attacks |
| 2024 | Sweden joins as the 32nd member |
