Era
20th century
54
21st century
19
19th century
10
1929
8
Colonial period, ca. 1600-1775
7
Civil War, 1861-1865
6
1933-1945
5
1867-1957
4
2000
3
2007
3
Heian period, 794-1185
3
Revolution, 1775-1783
3
-1400
2
1485-1547
2
1853-1890
2
1867-1912
2
1871-1948
2
1912-1950
2
1930-1961
2
1943
2
1950-
2
1951-
2
1972
2
1988
2
1990
2
1995
2
2002
2
2005
2
2006
2
2008
2
Anglo-Saxon period, 449-1066
2
Civil War, 2011-
2
German occupation, 1940-1945
2
To 332 B.C.
2
-1423
1
-1617
1
-1853
1
-303
1
-768
1
1032-1499
1
1159-1189
1
1510-1554
1
1533-1603
1
1564-1616
1
1564-1642
1
1592-1672
1
1599-1660
1
1600-1750
1
1605?-1679?
1
1606-1670
1
more ...