Treaty of Trianon

Trianon, Treaty of, World War I treaty that reduced Hungary's territory by almost two-thirds as punishment for its part in the war. Signed June 4, 1920 by Hungary and the Western Allies, including the United States, the treaty forced Hungary to relinquish almost 90,000 sq mi (233,100 sq km) to Romania, Czechoslovakia, and what is now Yugoslavia. As a result, the country lost all of its seaports as well as about 12 million inhabitants.

See also: World War I.