Subdivisions
The subdivisions of the Kingdom of Yugoslavia existed successively in three different forms. From 1918 to 1922, the kingdom maintained the pre–World War I subdivisions of Yugoslavia's predecessor states. In 1922, the state was divided into thirty-three oblasts (provinces). In 1929, after the establishment of the January 6 Dictatorship, a new system of nine banovinas (regions) was implemented by royal decree. In 1939, as an accommodation to Yugoslav Croats in the Cvetković-Maček Agreement, a single Banovina of Croatia was formed from two of these banovinas (and from sections of others).
Read more about this topic: Kingdom Of Yugoslavia