The Treaty of Trianon reference article from the English Wikipedia on 24-Apr-2004
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Treaty of Trianon

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The Treaty of Trianon was an agreement following World War I, which was supposed to regulate the post-war situation of the Hungarian state. It was signed on June 4, 1920, at the Grand Trianon Palace at Versailles, France, reducing the size and population of Hungary by about two thirds.

Hungarian territorial losses at TrianonEnlarge

Hungarian territorial losses at Trianon

Hungary lost most of its peripheral territories:

Several of these had a significant Magyar minority which can still be found in the same territories of these countries, estimated in 1920 at about 3,3 million people. Half of them lived in lands bordering Hungary, mainly in Slovakia.

Due to the treaty, Hungary lost the access to the sea it had through Croatia since 1102. Further provisions stated that its army be limited to 35,000 men, or that no railway shall be built with more than one track.

Hungary recovered some of the lost territories at the wake of World War II in 1939-1940, mainly upon the Agreements of Vienna, but the new boundaries agreed on at the Treaty of Paris in 1947 were nearly indentical with those of 1920.

see also History of Hungary, Treaty of Versailles