According to the same treaty, a referendum was to be held in southern Carinthia as suggested by the Allied Commission, which was to determine whether the area claimed by the SHS-State was to remain part of Austria or go to Yugoslavia. Much of southern Carinthia was divided into two zones. Zone A was formed out of predominantly Slovene-inhabited zones (approximately corresponding to today's District of Völkermarkt, the district of Klagenfurt-Land south of lake Wörthersee, and the south-eastern part of the present district of Villach-Land), while Zone B included the City of Klagenfurt, Velden am Wörthersee and the immediately surrounding rural areas where German speakers formed a vast majority. If the population in Zone A had decided for Yugoslavia, another referendum in Zone B would have followed. On 10 October 1920, the Carinthian Plebiscite was held in Zone A, with almost 60% of the population voting to remain in Austria, which means that about 40% of the Slovene-speaking population must have voted against a division of Carinthia. In view of the close supervision of the referendum by foreign observers, as well as the Yugoslav occupation of the area until four weeks prior to the referendum, irregularities alleged by the deeply disappointed Yugoslav supporters would not have substantially altered the overall decision. Yet, after the plebiscite, the SHS-State again made attempts to occupy the area, but owing to demarches by the United Kingdom, France, and Italy it removed its troops from Austria so that, by 22 November 1920, the State Diet of Carinthia was at last able to exercise its sovereignty over the entire state.