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Member countries (as of the knowledge cutoff date): 30 NATO member countries including the USA, UK, Canada, Germany, and France. Established in 1949.

Member countries: France, Russia, and the United Kingdom. Established in 1907.

Member countries: Germany, Austria-Hungary, and Italy. Established in 1882.

Member countries: Soviet Union, Albania, Poland, Romania, Hungary, East Germany, Czechoslovakia, and Bulgaria. Established in 1955.

Member countries: 58 members at its peak including France, the UK, Italy, and Japan. Established in 1920.

Member countries: Germany, Austria-Hungary, Ottoman Empire, and Bulgaria. Active during World War I.

Member countries: Main powers included France, Russia, the UK, Italy, and the USA. Active during World War I.

Member countries: Major powers included the USSR, the USA, China, and the UK. Active during World War II.

Member countries: Germany, Italy, and Japan were the three major Axis powers during World War II.

Member countries: Russia, Austria, and Prussia. Established in 1815.

Member countries: UK, Austria, Russia, and Prussia later joined by France. Established in 1815.

Member countries: UK, Austria, Prussia, and Russia. Established in 1815.

Member countries: France and the United Kingdom. Established in 1904.

Member city-states: Led by Athens with over 300 other member city-states. Established in 478 BC.

Member city-states: Led by Sparta with various other Greek city-states. Active during the 5th century BC.

Member countries: France and Russia. Established in 1892.

Member countries: Initially Germany and Japan, later joined by Italy and other countries. Established in 1936.

Member countries: UK, France, Belgium, Netherlands, and Luxembourg. Established in 1948.

Member countries: China, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, and Uzbekistan. Established in 2001.

Member countries: Australia, New Zealand, and the United States. Established in 1951.

Member countries: Philippines, Thailand, Pakistan, the United States, Australia, New Zealand, United Kingdom, and France. Established in 1954.

Member city-states: Several ancient Latin city-states including Rome. Established around the 7th century BC.

Member countries: Pope Julius II, Louis XII of France, Holy Roman Emperor Maximilian I, and Ferdinand II of Aragon. Established in 1508.

Established as part of the Treaty of Versailles in 1919.

Member countries: Egypt and Sudan. Established in 1956.

Member countries: Austria-Hungary and Germany. Established in 1879.

Member countries: The French Third Republic and the Russian Empire. Established in 1894.

Member countries: Nazi Germany and Italy. Established in 1939.

Led by Prince Metternich of Austria following the Napoleonic Wars, involving multiple European powers.