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The United States is, by far, the country that has the highest military spending of NATO countries, accounting for over one trillion U.S. dollars of the combined NATO military defense spending of 1.8 trillion dollars. By contrast, the other 31 member states of NATO combined spent approximately 777 billion dollars on defense, highlighting the key position the U.S. holds in the alliance. The NATO alliance was formed in the aftermath of World War Two with the aim of deterring Soviet expansion into Western Europe.

NATO at 76

In 2025, having lasted for 76 years, NATO is arguably the world's most successful military alliance. Since its founding in 1949, the alliance expanded from 12 countries to 32, with the two most recent additions (Finland and Sweden) a direct consequence of Russia's invasion of Ukraine. Although to some extent, the invasion gave NATO a clear sense of purpose, the alliance has recently come under strain. During the first and second terms of Donald Trump, the U.S. leader frequently chastised member states who spent a lower share of their GDP on defence. 

NATO after the Cold War

After the fall of the Soviet Union in the early 1990s, the concentration of NATO’s military resources were focused elsewhere. Interventions in Bosnia and Kosovo, followed by the War in Afghanistan, saw a large rise in the defense spending of some NATO countries. In particular, defense spending by the United States rose dramatically between 2001 and 2011, rising from 312 billion U.S. dollars to 711 billion U.S. dollars. While the mid-2010s saw a noticeable decline in defence spending as a share of GDP, among member states, this trend was reversed due to the worsening security situation in Europe since 2022.