NATO began as an answer to a single fear, and 77 years on it is straining to hold the line against a new one.
The North Atlantic Treaty was signed in Washington on 4 April 1949 by 12 founding states, from the United States and Canada to Iceland and Luxembourg. At its heart sits Article 5, the pledge that an armed attack on one member is an attack on all.
For decades that clause went unused. The alliance grew outward instead, from Greece and Turkey in 1952 and West Germany in 1955, through Spain in 1982, then a wave of former Warsaw Pact states after the Cold War. Finland joined in 2023 and Sweden in 2024, bringing the total to 32 members.
Article 5 has been triggered exactly once, on 12 September 2001, in response to the 9/11 attacks on the United States. The invocation sent NATO forces to Afghanistan, its first combat operation outside Europe.
The original mission, containing the Soviet Union, never produced a direct war. Moscow did once ask to join, in 1954, and was refused; the Warsaw Pact followed in 1955, and the two alliances faced each other for the next four decades until the Soviet bloc collapsed.
Russia’s annexation of Crimea in 2014 pulled the alliance back to its roots. Members agreed at that year’s Wales summit to spend 2% of gross domestic product on defence, and the 2022 invasion of Ukraine sharpened the shift, with Finland and Sweden abandoning neutrality to join.
The treaty itself runs to just 14 articles and roughly 1,600 words. Its force has always depended less on the text than on American commitment, and the second Trump administration has openly questioned how far that commitment extends. Combined NATO defence spending now tops US$1.588 trillion a year, and members have pledged to lift their target to 5% of GDP.
Sources
- The Washington Treaty — NATO Founding (1949) — by Luiz H. S. Brandão
- NATO & the Soviet Union: History, Cold War Rivalry
