The national minorities question in Romania has been one of crises and polemics. This is due, in part, to the fact that Greater Romania, established at the end of World War I, brought the Old Romanian Kingdom into a body politic (a kingdom itself relatively free of minority problems), with territories inhabited largely by national minorities. Thus, the population of Transylvania and the Banat, both of which had been constituent provinces of the defunct Austro-Hungarian Monarchy, included large numbers of Hungarians and Germans, while Bessarabia, a province of the Russian empire, included large numbers of Jews. While the Hungarian (Szeklers and Magyars), Germans (Saxons and Swabians), and Jewish minorities were the largest and most difficult to integrate into Greater Romania, other sizeable national minorities such as the Bulgarians, Russians, Ukrainians, Tatars, Serbians, Turks, and Gypsies also posed problems to the rulers of Greater Romania during the interwar period and, in some cases, even after World War II.