Yugoslavia
From 1918 until 1928 it was called the Kingdom of the Serbs, Croats, and Slovenes. From 1928 until World War II it was the Kingdom of Yugoslavia. After WWII it was renamed the Socialist Federal Republic of Yugoslavia with six republics, 2 autonomous provinces: Bosnia-Herzegovina, Croatia, North Macedonia, Montenegro, Serbia, and Slovenia and two autonomous provinces in Serbia: Vojvodina in the north, and Kosovo, next to Albania.