[citation needed] Some (mostly eastern) parts of Bácska were incorporated into the Theiß-Marosch section of the Military Frontier.
The county was recreated in 1860, when the Voivodeship of Serbia and Banat of Temeschwar was abolished and the area was again incorporated into the Habsburg Kingdom of Hungary.
By the Treaty of Trianon of 1920, the territory of the county was divided between the Kingdom of Serbs, Croats and Slovenes and Hungary.
Until 1922, the southern part of the former Bács-Bodrog county was a de facto province of the Kingdom of Serbs, Croats and Slovenes with the seat in Novi Sad.
After World War II, the border between Yugoslavia and Hungary was restored in 1947 by the Paris Peace Treaties and the county's territory was reduced again.
During the 18th century, the Habsburgs carried out an intensive colonisation of the area, which had low population density after the last Ottoman wars.
The Serb (including Croats, Bunjevci and Šokci) share had dropped to 44% or 170,942, with the number of Hungarians rising to 121,688 and Germans to 91,016, or 31% and 23%, respectively.
The city of Újvidék in the southern part of the county was the cultural and political centre of the Serbs in the 18th and 19th centuries.
In the early 19th century Bács-Bodrog County was divided into:[8][9] Šajkaška was part of the Military Frontier at this time.