What countries are members of NATO?
Answer
The U.S., Canada, and European nations
Explanation
NATO members include the United States, Canada, and European nations, totaling 32 countries as of 2024. The alliance was founded on April 4, 1949 by 12 original signatories: the United States, the United Kingdom, Canada, France, Italy, Belgium, the Netherlands, Luxembourg, Norway, Denmark, Iceland, and Portugal. Membership has expanded in nine separate rounds since then.
Greece and Turkey joined in 1952, providing strategic depth in the eastern Mediterranean. The Federal Republic of Germany, also called West Germany, joined on May 9, 1955, prompting the Soviet Union to form the Warsaw Pact five days later. Spain joined in 1982 after the death of Francisco Franco and the country's transition to democracy.
The first round of post Cold War enlargement brought in three former Warsaw Pact countries on March 12, 1999: the Czech Republic, Hungary, and Poland. The largest single round took place on March 29, 2004, when seven nations joined: Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia, and Slovenia. Three of those, Estonia, Latvia, and Lithuania, had been part of the Soviet Union itself.
Albania and Croatia joined on April 1, 2009. Montenegro joined on June 5, 2017, North Macedonia on March 27, 2020, Finland on April 4, 2023, and Sweden on March 7, 2024. The Finnish and Swedish accessions, prompted by Russia's full-scale invasion of Ukraine in February 2022, ended decades of Nordic neutrality.
Members commit to spending at least 2 percent of gross domestic product on defense, a target that more than two-thirds of NATO members met in 2024. The members include several of the world's largest economies and strongest militaries. Together, NATO populations total about 950 million people, and combined defense spending exceeds 1.3 trillion dollars annually, more than half of global military spending.
Notable European countries that are not NATO members include Switzerland, Austria, Ireland, Serbia, and Russia. Ukraine, Georgia, and Bosnia and Herzegovina are official aspirants. NATO operates by consensus, meaning every member must agree on major decisions. The alliance maintains a permanent multinational military command structure under Supreme Allied Commander Europe, who is always an American officer.
Why this matters for your test
USCIS uses this question to confirm applicants understand the geographic and political reach of the most important American alliance. Knowing the membership makes it easier to follow modern news about NATO expansion, defense spending, and disputes with Russia.
Source: USCIS 128 Civics Questions (2025)
