what country did serbia become part of after ww1
History of Serbia The Serbian realms disappeared by the mid-16th century, torn by domestic feuds and overcome by Ottoman conquest. The success of the Serbian revolution against Ottoman rule in 1817 marked the birth of the Principality of Serbia, which achieved de facto independence in 1867 and finally gained recognition by the Great Powers in the Berlin Congress of 1878. As a victor in the Balkan Wars of 1912-1913, Serbia regained Vardar Macedonia, Kosovo and Raška (Old Serbia). In late 1918 the region of Vojvodina proclaimed its secession from Austria-Hungary to unite with the pan-Slavic State of Slovenes, Croats and Serbs; the Kingdom of Serbia joined the union on 1 December 1918, and the country was named the Kingdom of Serbs, Croats, and Slovenes.
Czechoslovakia Czechoslovakia, or Czecho-Slovakia[1] (/ˌtʃɛkoʊsloʊˈvækiə, -kə-, -slə-, -ˈvɑː-/;[2][3] Czech and Slovak: Československo, Česko-Slovensko[4][5]), was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the Czech Republic and Slovakia on 1 January 1993.