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Established as part of the Treaty of Versailles in 1919.

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

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

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

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

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

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

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

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

Member countries: Egypt and Sudan. Established in 1956.

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

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

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

Countries involved: India and Pakistan. Established in 1966.

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

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

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

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

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

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

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

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

Member countries: France and Russia. Established in 1892.

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

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