List of Former Slavic countries in plain text you can copy and paste:
- Austrian Silesia
- Austro-Hungarian rule in Bosnia and Herzegovina
- Principality of Beloozero
- Bihać Republic
- Bosnia
- Bulgarian Empire
- First Bulgarian Empire
- Second Bulgarian Empire
- Socialist Soviet Republic of Byelorussia
- Byelorussian Soviet Socialist Republic
- Carantania
- Carpatho-Ukraine
- Catepanate of Ras
- Principality of Chernigov
- Cossack Hetmanate
- Free City of Cracow
- Kingdom of Croatia
- Kingdom of Croatia
- Duchy of Croatia
- Czech and Slovak Federative Republic
- Czechoslovak Socialist Republic
- Czechoslovakia
- Decree on the system of government of Russia
- Despotate of Dobruja
- Don Republic
- Duchy of Kopanica
- Duchy of Pannonian Croatia
- Duklja
- Eastern Okraina
- Eastern Rumelia
- Eastern Slavonia, Baranja and Western Syrmia
- Far Eastern Republic
- Galicia
- Kingdom of Galicia–Volhynia
- Great Moravia
- History of Moravia
- Hutsul Republic
- Kingdom of Illyria
- Independent State of Croatia
- Kievan Rus'
- Kingdom of Bohemia
- Kingdom of Bosnia
- Kingdom of Croatia-Slavonia
- Kingdom of Dalmatia
- Kingdom of Galicia and Lodomeria
- Kingdom of Yugoslavia
- Kruševo Republic
- Kuban People's Republic
- Kuyaba
- Grand Duchy of Lithuania
- Lithuanian–Byelorussian Soviet Socialist Republic
- Province of Ljubljana
- Lower Pannonia
- Kingdom of Montenegro
- Moravian Serbia
- Grand Duchy of Moscow
- Principality of Murom
- Narentines
- Novgorod Republic
- Principality of Lower Pannonia
- People's Republic of Bulgaria
- Principality of Peremyshl
- Polish–Lithuanian Commonwealth
- Principality of Polotsk
- Prince-Bishopric of Montenegro
- Principality of Montenegro
- Principality of Pskov
- Principality of Ryazan
- Principality of Nizhny Novgorod-Suzdal
- Principality of Zeta
- Protectorate of Bohemia and Moravia
- Provisional Priamurye Government
- Pskov Republic
- Republic of Ragusa
- Raška
- Republic of Montenegro
- Republic of Serbia
- Republic of Užice
- Republic of Zakopane
- Revolutionary Serbia
- Rus' Khaganate
- Russian Empire
- Russian Republic
- Russian Soviet Federative Socialist Republic
- Samo's Empire
- SAO Eastern Slavonia, Baranja and Western Syrmia
- Voivodeship of Serbia and Banat of Temeschwar
- Serbia and Montenegro
- Grand Principality of Serbia
- Kingdom of Serbia
- Kingdom of Serbia
- Principality of Serbia
- Principality of Serbia
- Serbian Despotate
- Serbian Empire
- Republic of Serbian Krajina
- Serbian Sklavinia
- Kingdom of Serbs, Croats and Slovenes
- Kingdom of Slavonia
- Slovak Republic
- Slovak Soviet Republic
- Principality of Slutsk
- Principality of Smolensk
- Socialist Republic of Bosnia and Herzegovina
- Socialist Republic of Croatia
- Socialist Republic of Macedonia
- Socialist Republic of Montenegro
- Socialist Republic of Serbia
- Socialist Republic of Slovenia
- Soviet Union
- State of Slovenes, Croats and Serbs
- Travunija
- Principality of Trubetsk
- Tsardom of Russia
- Principality of Toropets
- Principality of Tver
- West Ukrainian People's Republic
- Ukrainian People's Republic
- Ukrainian Soviet Socialist Republic
- Ukrainian State
- Republic of Vevčani
- Vistulans
- Vladimir-Suzdal
- Duchy of Warsaw
- Principality of Yaroslavl
- Yugoslavia
- Zachlumia
- Zemstvo of Maritime Territory
- Zeta under the Balšići
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