 Wishing to express their national individuality and confronted with the new Hungarian authorities, Serbs declared the constitution of the "Serbian Voivodship" (Serbian Duchy) at the May Assembly in Sremski Karlovci (May 13–15, 1848).The Serbian Voivodship consisted of Srem, Bačka, Banat, and Baranja regions.The Serbs also formed a political alliance with the Croats "based on freedom and perfect equality".