Banat, Bačka and Baranja

Banat, Bačka and Baranja (Serbian: Banat, Bačka i Baranja / Банат, Бачка и Барања) was a de facto province of the Kingdom of Serbia and the Kingdom of Serbs, Croats and Slovenes between October 1918 and March 1919. It included geographical regions of Banat, Bačka, and Baranja and its administrative center was Novi Sad.
Name
The official name of the province was Banat, Bačka and Baranja, but it was also unofficially known as Vojvodina.
History
Following the collapse of Austria-Hungary in October 1918, the regions of Banat, Bačka and Baranja were under control of the Serbian army. The local ethnic Serb population from these regions formed its own administration under the supreme authority of Serbian National Board in Novi Sad.
On November 25, 1918, the Great people's assembly of Serbs, Bunjevci and other Slavs (Velika narodna skupština Srba, Bunjevaca i ostalih Slovena / Велика народна скупштина Срба...