Era
20th century
75
1900-1999
62
19th century
35
1800-1899
20
Civil War, 1861-1865
15
1775-1865
14
1861-1865
13
1951-
10
Since 1951
7
Revolution, 1775-1783
6
1811-1872
5
1849-1877
5
1865-1950
5
18th century
5
Colonial period, ca. 1600-1775
5
1700-1799
4
1775-1783
4
1800-1999
4
1898-1951
4
1947-
4
1769-1828
3
1775-1899
3
1783-1865
3
1858-1919
3
1865-1898
3
To 1775
3
1656-1680
2
1741-1801
2
1756-1836
2
1757-1804
2
1810-1849
2
1822-1913
2
1830-1908
2
1856-1940
2
1860-1890
2
1865-1918
2
1870-1938
2
1884-1962
2
1890-1983
2
1898-1999
2
1901-1909
2
1931-2020
2
1932-2015
2
1939 - 1945
2
1939-
2
1939-1945
2
1944-
2
1945-
2
1946-
2
1950-
2
more ...