Era
20th century
37
19th century
33
Civil War, 1861-1865
33
1959-
17
18th century
12
1809-1865
11
1963-
10
Revolution, 1775-1783
10
1706-1790
7
1887-1967
7
Colonial period, ca. 1600-1775
7
1732-1799
6
1644-1718
5
21st century
5
1865-1951
4
1918-
4
1933-1945
4
1964-
4
1
3
1674-1751
3
1715-1779
3
1734-1806
3
17th century
3
1821-1902
3
1822-1885
3
1822-1901
3
1838-1922
3
1843-1901
3
1843-1916
3
1844-1916
3
1856-1915
3
1860-1870
3
1860-1938
3
1882-1945
3
1898-
3
1901-1909
3
To 1775
3
1671-1735
2
1723-1809
2
1727-1795
2
1728-1786
2
1729-1785
2
1729-1807
2
1731-1821
2
1734-1820
2
1741-1810
2
1743-1826
2
1753-1821
2
1761-1839
2
1783-1872
2
more ...