Danubia is a general term used to refer to an area of the Balkans along the river Danube. It is also used to refer to several confederations of states in the region.
Slavonic Union, 1918-1919
Danubian Confederation, 1919-1947
Following the entry of Bulgaria and Dalmatia into the Slavonic Union, the federation was renamed Danubian Confederation to reflect the importance of the Danube to the country. The renaming was brought about since Dalmatia was a non-Slavic nation. Its members were Bulgaria, Croatia, Dalmatia, Serbia and Slovenia. As part of the dissolution of the Austrian Empire, control of its colonies was given to the Danubian Confederation. These were Gold Coast, Kamerun, Kongo, Mali, Togoland and Upper Volta, which were all reclassified as protectorates instead of colonies. The DC fell into civil war during the Second Great War and was reformed in 1947 under the leadership of Josip Broz's communists.
The Confederation of Soviet Danubian States was the successor to the Danubian Confederation, established following the victory of communist forces under Josip Broz.