states (however, most of the resulting states nevertheless became multi-ethnic states comprising several nationalities). The Treaty of Trianon of 1920 defined borders for the new Hungarian state: in the north, the Slovak and Ruthene areas, including Hungarian majority areas became part of the new state of Czechoslovakia. Transylvania and most of the Banat became part of Romania, while Croatia-Slavonia and the other southern areas became part of the new state of Yugoslavia. The arguments of Hungarian irredentists for their goal were: the presence of Hungarian majority areas in the neighboring countries, perceived historical traditions of the Kingdom of Hungary, or the perceived geographical unity and economic symbiosis of the region within the Carpathian Basin, although some Hungarian irredentists preferred to regain only ethnically Hungarian majority areas surrounding Hungary. Post-Trianon Hungary had about half of the population of the former Kingdom. The population of the territories of the Kingdom of Hungary that were not assigned to the post-Trianon Hungary had, in total, non-Hungarian majority, although they included a sizable proportion of ethnic Hungarians and Hungarian majority areas. According to Károly Kocsis and Eszter Kocsis-Hodosi, the ethnic composition (by their native language) in 1910 (note: three-quarters of the Jewish population stated Hungarian as their mother tongue, and the rest, German, in the absence of Yiddish as an option): Trianon thus defined Hungary's new borders in a way that made ethnic Hungarians the overwhelmingly absolute majority in the country. Almost 3 million ethnic Hungarians remained outside the borders of post-Trianon Hungary. A considerable number of non-Hungarian nationalities remained within the new borders of Hungary, the largest of which were Germans (Schwabs) with 550,062 people (6.9%). Also, the number of Hungarian Jews remained within the new borders was 473,310 (5.9% of the total population), compared with 911,227 (5.0%), in 1910. Aftermath After the Treaty of Trianon, a political concept known as Hungarian Irredentism became popular in Hungary. The Treaty of Trianon was an injury for the Hungarian people and Hungarian nationalists have created an ideology with the political goal of the restoration of borders of historical pre-Trianon Kingdom of Hungary. The justification for this aim usually followed the fact that two-thirds of the country's area was taken by the neighboring countries with approximately 3 million Hungarians living in these territories. Several municipalities that had purely ethnic Hungarian population were excluded from post-Trianon Hungary, which had borders designed to cut most economic regions (Szeged, Pécs,