Serbian–Hungarian Baranya–Baja Republic

The Serbian–Hungarian Baranya–Baja Republic (Hungarian: Baranya-Bajai Szerb-Magyar Köztársaság, Serbian: Српско-мађарска република Барања-Баја / Srpsko-mađarska republika Baranja-Baja) was a small, short-lived and Soviet-oriented state, proclaimed in Pécs on 14 August 1921, on occupied Hungarian territory during the peacemaking aftermath of the first World War, tolerated and fostered by the newly proclaimed Kingdom of Serbs, Croats and Slovenes. Its territory included the geographical region of Baranya and the northern part of Bačka region, as well as a portion of the Banat.

Source: Wikipedia — Serbian–Hungarian Baranya–Baja Republic (CC BY-SA 4.0)