"The greatest catastrophe to have befallen Hungary since the battle of Mohacs in 1526," the Treaty of Trianon in 1920, was extremely harsh on Hungary and unjustifiably one-sided. The resulting "treaty" cost Hungary an unprecedented 2/3 of her territory, and 1/2 of her total population or 1/3 of her ethnic-Hungarian population. Add to this the loss of all her seaports, up to 90% of her vast natural resources, industry, railways, and other infrastructure. Millions of Hungarians saw borders arbitrarily redrawn around them, without plebiscites, ignoring President Wilson's lofty goal of national self-determination. The absurd treaty ignored a millenia of nation building and age-old cultural affiliations, created arbitrary borders and new countries, and created millions of new minorities who today struggle for survival of the ethnic identity. Western powers, primarily Britain and France, refused to re-visit the disaster they created at Versailles and led us into another great war. Two of the three newly created countries carved out of Hungarian territory no longer exist. The "Slovakia" (formerly Upper Hungary) part of Czechoslovakia split with the Czech Republic while "Yugoslavia" suffered from tragic civil war and the ravages of ethnic cleansing.
http://americanhungarianfederation.org/news_trianon.htm
https://www.quora.com/Will-the-Trea...ry-ever-get-back-some-of-her-stolen-territory
http://www.politics.hu/20130604/hungarians-cannot-come-to-terms-with-trianon-treaty-says-ader/
Treaty of Trianon - the dismemberment of Hungary
http://www.hunsor.se/trianon/treatyoftrianon1920.htm