Era
20th century
153
19th century
128
Civil War, 1861-1865
120
18th century
40
1945-1989
33
21st century
31
Revolution, 1775-1783
31
1900-1999
26
1945-
24
1989-
23
1800-1899
20
1861-1865
19
1783-1865
18
Colonial period, ca. 1600-1775
18
1809-1865
17
1933-1945
16
1946-
16
1775-1783
15
20e siècle
15
1917-1963
14
2001-2009
12
1945-1953
11
1743-1826
10
2000-2099
10
1775-1865
9
1882-1945
9
1953-1961
9
1961-1963
9
Since 1945
9
1877-1964
8
1969-1974
8
1732-1799
7
1865-1918
7
1980-
7
19e siècle
7
2009-2017
7
1858-1919
6
1861-1865 (Guerre de Sécession)
6
1865-1933
6
1866-1895
6
1969-
6
2017-2021
6
To 1775
6
1783-1815
5
17th century
5
1815-1861
5
1818-1895
5
1863-1877
5
1884-1972
5
1923-
5
more ...