Era
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1889-1945
6
1900 - 1999
6
1948-
6
2002-
6
Since 1991
6
17th century
5
1800-1899
5
1800-1999
5
1910-1936
5
1916-2009
5
1918-1933
5
1924-
5
1924-2018
5
1961-1971
5
1965-1975
5
1971-1981
5
1985-1991
5
1990-
5
1991-2003
5
Soviet occupation, 1979-1989
5
Vietnam War, 1961-1975
5
1808-1889
4
1871-1918
4
1888-1918
4
1890-1969
4
1900-1945
4
1901-1910
4
1901-1936
4
1913-2006
4
1937-2006
4
1952-
4
1952-1970
4
1974-1977
4
1994-2011
4
2014-
4
German occupation, 1941-1944
4
Since 2003
4
16th century
3
1837-1901
3
1839-1881
3
1859-1941
3
1861-1865
3
1865-1921
3
1890-1970
3
18th century
3
1902-1974
3
1918-1945
3
1922-
3
1922-1945
3
1923-
3
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