After news of the Parisrevolution of 1848 reached the Austrian Empire, the absolutist reign of Klemens Wenzel, Prince von Metternich was weakened. At this time the regions of Banat, Bačka and Syrmia were administratively divided between the Habsburg Kingdom of Hungary (in the north) and the Habsburg Military Frontier (in the south). A sizeable percent of the Austrian soldiers serving on the Military Frontier were ethnic Serbs, who protected Austrian borders in exchange for certain political freedoms that they were able to enjoy within the frontier, whose administration functioned independently from the county-system of the Habsburg Kingdom of Hungary.
After the outbreak of the revolution in the Habsburg Kingdom of Hungary on 15 March 1848, the new government of the kingdom refused to accept the Serbs' request for recognition of their national rights, taking a stance that all citizens of the Kingdom of Hungary are Hungarians. Serbs, whose national rights and freedoms were previously regulated within the Habsburg monarchy saw the Hungarian position as a degradation of their status. After the initial Serb political demands for recognition of their national rights were rejected by the new government of the Kingdom of Hungary, Serb demands became more radical and the Serb national movement turned against the new revolutionary government of the Kingdom of Hungary.
Assembly
Realizing that Hungarian revolutionary leaders are not willing to recognize national rights of the Serbs, political leaders of the Serbs decided to hold an assembly on which a separate Serb voivodeship within Austrian Empire would be proclaimed.
Decisions of the May Assembly were later recognized by the Austrian emperor, who reciprocated to Serbs for participating in the war against Hungarian rebels. Austrian Constitution of 4 March 1849 (Article 72) approved the formation of Serbian Vojvodina (German: Woiwodschaft Serbien), that was accomplished by the official formation of a separate crownland named Voivodeship of Serbia and Banat of Temeschwar (formed in November 1849).[8] The new Voivodeship was independent from Habsburg Kingdom of Hungary and was directly subordinated to Vienna. It consisted of the regions of Banat, Bačka and Syrmia (municipalities of Ilok and Ruma), excluding parts that were within the Habsburg Military Frontier.[8][9] This Voivodeship, however, had somewhat different borders from Serbian Vojvodina that was proclaimed in 1848 and essentially functioned as an administrative district.[10][11] It was more ethnically mixed and included eastern parts of Banat with mainly Romanian population, while parts of the Military Frontier in which Serbs formed the majority were not included into new Habsburg crownland.
^Ivanišević, Alojz (1984). Kroatische Politik der Wiener Zentralstellen von 1849 bis 1852 (in German). VWGÖ. p. 48. ISBN9783853695784. ..die Einverleibung der seit dem 18.11.1849 zur [Serbisch] Vojvodschaft gehörenden syrmischen Bezirke Ruma und Ilok
^Unkovski-Korica, Vladimir (2018). "World War II and the National Question: The Origins of the Autonomous Status of Vojvodina in Yugoslavia". In Cox, Terry (ed.). Geoffrey Swain: Against the Grain. Routledge. ISBN9781351393126.