Era
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1964-
1
1966-
1
1970-
3
1971-
2
1975-
1
1980-
2
1983-
1
1993-2001
2
19th century
43
2000
1
2000-2099
2
2001-2009
2
2009-2017
1
2017-
3
20th century
31
21st century
11
Civil War, 1861-1865
5
Colonial period, ca. 1600-1775
2
Revolution, 1775-1783
2
Revolutionary period, 1775-1783
2
Siege, 1775-1776
1
Since 1971
2
Since 1975
1
Since 2017
1
To 1775
1