Era
20th century
62
19th century
41
21st century
29
18th century
17
2001-2009
14
1989-
10
1945-1989
8
1933-1945
7
1993-2001
7
Civil War, 1861-1865
7
17th century
6
1946-
6
1945-
5
1945-1953
5
Revolution, 1775-1783
5
1953-1961
4
1980-2020
4
1882-1945
3
1960-1980
3
1961-1969
3
1969
3
1993-
3
1661?-1731
2
1667-1745
2
16th century
2
1702-1714
2
1732-1799
2
1760-1789
2
1783-1865
2
1789-1869
2
1865-1918
2
1883-1945
2
1913-1994
2
1935-
2
1951-
2
1969-1974
2
1981-1989
2
1991-
2
2002-
2
2008
2
2009-
2
2017-2021
2
Civil War, 1642-1649
2
Colonial period, ca. 1600-1775
2
Revolution, 1959
2
To 1775
2
To 1900
2
1265-1321
1
1552?-1599
1
1558-1603
1
more ...