Administrative divisions of Yugoslavia
Yugoslavia had various administrative divisions throughout its 74 years of existence. == 1918–1922 == From 1918 to 1922, the Kingdom of Serbs, Croats, and Slovenes continued to be subdivided into the pre-World War I divisions (districts, counties and kingdoms) of the Habsburg monarchy and the formerly independent Balkan kingdoms of Serbia and Montenegro.
Source: Wikipedia — Administrative divisions of Yugoslavia (CC BY-SA 4.0)