Era
20th century
157
1900-1999
67
21st century
33
19th century
24
1939-1945
13
2000-2099
13
Civil War, 1861-1865
10
1900-2099
8
1945-1989
8
1993-
8
1800-1899
7
18th century
7
1933-1945
7
1800-1999
5
1939 - 1945
5
1945-
5
1881-1949
4
1989-
4
17th century
3
1809-1865
3
1843-1916
3
1861-1865
3
1882-1945
3
1882-1965
3
1902-1974
3
1946-
3
1960-
3
1960-1980
3
To 1865
3
1736-1803
2
1740-1785
2
1856-1946
2
1866-1939
2
1873-1962
2
1874-1949
2
1875-1939
2
1878-1971
2
1882-1928
2
1884-1915
2
1884-1965
2
1886-1950
2
1894-1964
2
1900 - 1999
2
1938-
2
1947-
2
1968-
2
Revolution, 1775-1783
2
Since 1945
2
Since 1993
2
-1913
1
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