Era
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1945-1980
6
1959-1990
6
1974-1977
6
Since 1945
6
1917-1921
5
1918-1933
5
1923-
5
1924-
5
1945-1979
5
1970-1991
5
1973-1993
5
Occupation, 1939-1945
5
1871-1918
4
1891-1967
4
1900 - 1999
4
1961-1989
4
1967-1973
4
1981-
4
1986-1991
4
Since 1900
4
1893-1976
3
1894-1917
3
18th century
3
1912-1949
3
1913-2006
3
1915-1998
3
1919-1932
3
1929-1933
3
1945 - 1989
3
1953-1991
3
1961-1969
3
1965-1975
3
1975-1991
3
1976-
3
1979-
3
1981-1985
3
1997-
3
Allied occupation, 1945-1955
3
Blockade, 1948-1949
3
Revolution, 1956
3
Since 1989
3
Soviet occupation, 1939-1941
3
-1540
2
1700-1799
2
1821-1866
2
1866-1914
2
1876-1951
2
1884-1948
2
1884-1975
2
1885-1952
2
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