NORTH ATLANTIC TREATY ORGANIZATION
NATO is a collective security alliance formed in 1949 as an anti-Soviet military alliance. It initially consisted of 10 European countries, and the United States and Canada. Today it consists of 30 countries, including Belgium (1949), Canada (1949), Denmark (1949), France (1949), Iceland (1949), Italy (1949), Luxembourg (1949), Netherlands (1949), Norway (1949), Portugal (1949), United Kingdom (1949), United States (1949), Greece (1952), Turkey (1952), Germany (1955), Spain (1982), Czech Republic (1999), Hungary (1999), Poland (1999), Bulgaria (2004), Estonia (2004), Latvia (2004), Lithuania (2004), Romania (2004), Slovakia (2004), Slovenia (2004), Albania (2009), Croatia (2009), Montenegro (2017), North Macedonia (2020). Many of the countries that joined NATO after 1991 were former Soviet Republics or Warsaw Pact countries.