State of Slovenes, Croats and Serbs
Following the dissolution of Austro-Hungarian Empire in the aftermath of the World War I, a National Council of Slovenes, Croats and Serbs took power in Zagreb on 6 October 1918. On 29 October independence was declared by a national gathering in Ljubljana, and by the Croatian parliament, declaring the establishment of the new State of Slovenes, Croats and Serbs. On 1 December 1918 the State of Slovenes, Croats and Serbs merged with Serbia, becoming part of the new Kingdom of Serbs, Croats and Slovenes, itself being renamed in 1929 to Kingdom of Yugoslavia.