Originally posted by Raptor
The Republic of Yugoslavia was one country from the end of WW2 to 1991
The Kingdom of Yugoslavia (1 December 1918–April 17, 1941), also known as the First Yugoslavia, was a monarchy formed as the "Kingdom of Serbs, Croats and Slovenes" after World War I and re-named on 6 January 1929 by Alexander I of Yugoslavia. It was invaded on 6 April 1941 by the Axis powers and capitulated eleven days later.
The Socialist Federal Republic of Yugoslavia (29 November 1943–25 June 1991), a socialist successor state to the Kingdom of Yugoslavia, existed under various names, including the "Democratic Federation of Yugoslavia (DFY)" (1943), the "Federal People's Republic of Yugoslavia (FPRY)" (1946), and the "Socialist Federal Republic of Yugoslavia (SFRY)" (1963). It disintegrated in the Yugoslav Wars, which followed the secession of most of the constituent elements of SFRY.
The Federal Republic of Yugoslavia (FRY) (April 27, 1992–February 4, 2003), was a federation on the territory of the two remaining republics of Serbia (including the autonomous provinces of Vojvodina and Kosovo and Metohija) and Montenegro.