Era
20th century
235
1900-1999
107
21st century
38
19th century
37
1939-1945
26
1933-1945
25
2000-2099
15
Civil War, 1861-1865
15
1945-1989
10
1800-1899
9
1800-1999
9
1882-1945
9
18th century
9
1900-2099
8
1993-
8
1939 - 1945
7
1889-1945
6
1945-
6
1956-
6
17th century
5
1918-1945
5
1989-
5
1860-1951
4
1881-1949
4
1900 - 1999
4
1913-1994
4
1923-
4
1960-
4
1809-1865
3
1843-1916
3
1861-1865
3
1882-1965
3
1902-1974
3
1904-1991
3
1946-
3
1948-
3
1960-1980
3
Colonial period, ca. 1600-1775
3
Revolution, 1775-1783
3
To 1865
3
-1975
2
-1989
2
1600-1799
2
1736-1803
2
1740-1785
2
1800 - 1999
2
1822-1885
2
1849-1887
2
1856-1946
2
1858-1942
2
more ...