Warsaw Pact
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Albania
Independent Albania
1912–1914
Principality
of Albania
1914–1925
Albanian
Republic
1925–1928
Albanian
Kingdom
1928–1934
Albanian
Kingdom
1934–1939
Albanian
Kingdom
1939–1943
German Occupied Albania
1943–1944
Democratic Government of Albania
1944–1946
People’s Socialist Republic of Albania
1946–1992
Republic of Albania
1992–
Bulgaria
Principality of Bulgaria
1878–1908
Kingdom of Bulgaria
1908–1947
People’s Republic of Bulgaria
1947–1948
People’s Republic of Bulgaria
1948–1967
People’s Republic of Bulgaria
1967–1971
People’s Republic of Bulgaria
1971–1990
Republic of Bulgaria
1990–
Czechoslovakia
First Czech Republic
1918–1920
First Czech Republic
1920–1938
Second Czech Republic
1938–1939
Protectorate of Bohemia & Moravia
1939–1945
Czechoslovak Socialist Republic
1945–1989
Czech & Slovak Federative Republic
1990–1992
Czech Republic
1990–1992
Czech Republic
1993–
Autonomous Slovak Land
1938–1939
First Slovak Republic
1939–1945
Slovak Soviet Socialist Republic
1969–1990
Slovak Republic
1990–1992
Slovak Republic
1992–
Slovak Soviet Republic
1918
Hungary
Kingdom of Hungary
1848–1918
Hungarian People’s Republic
1918–1919
Hungarian Soviet Republic
1919
Hungarian Republic
1919–1920
Kingdom of Hungary
1920–1946
Hungarian Republic
1946–1949
Hungarian People’s Republic
1949–1956
Hungarian People’s Republic
1956–1957
Hungarian People’s Republic
1957–1990
Hungarian Republic
1990–
Poland
Republic of Poland
1919–1939
German Occupied Poland
1939–1944
Republic of Poland
1945–1952
Polish People’s Republic
1952–1989
Republic of Poland
1989–
Free City of Danzig
1920–1939
Romania
Principality of Romania
1866–1881
Kingdom of Romania
1881–1948
Romanian People’s Republic
1948
Romanian People’s Republic
1948–1952
Romanian People’s Republic
1952–1965
Romanian People’s Republic
1965–1989
Romania
1989–