Era
20th century
16
19th century
10
Revolution, 1775-1783
10
Civil War, 1861-1865
9
21st century
8
1900-1999
7
1859-1929
6
War of 1812
6
1800-1899
5
1971-1980
5
1912-1967
4
1931-1940
4
1941-1950
4
To 1901
4
1779-1843
3
1808-1895
3
1826-1864
3
1898-1979
3
1903-1986
3
1911-1920
3
1915-1959
3
1809-1865
2
1847-1903
2
1879-1915
2
1929
2
1941-
2
1961-1970
2
1991-2000
2
2000-2020
2
-1793
1
1775-1783
1
1785-1819
1
1812-1815
1
1858-1942
1
1859-1907
1
1860-1935
1
1861-1865
1
1861-1865 (Guerra civil)
1
1873-1925
1
1882-1945
1
1885-1949
1
1890-1899
1
1891-1900
1
1900 - 1999
1
1900 - 2099
1
1901-1910
1
1910-1956
1
1911-1950
1
1918-1945
1
1921-1930
1
more ...