Era
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1951-
4
1953-1961
3
1957-
1
1960
1
1960-1980
4
1961-1963
3
1961-1969
2
1962-
1
1963-1969
2
1964
2
1968
2
1969-
2
1969-1974
5
1974-1977
3
1977-1981
12
1979-1997
1
1980
3
1980-
1
1981-1989
23
1981-1993
2
1981-2001
3
1989-
31
1989-1993
2
1993-2001
2
19th century
6
2000-2099
10
2001-2009
4
2009-
1
2009-2017
4
2016
1
2017-
7
2017-2021
1
20th century
209
21st century
36
Civil War, 1861-1865
1
Geschichte 1900-2000
1
Geschichte 1960-1990
1
Revolution, 1775-1783
3
Since 1865
1
Since 1900
13
Since 1945
1
Since 2000
6