Era
Civil War, 1861-1865
18
20th century
7
1841-1845
5
Revolution, 1835-1836
4
1793-1863
3
19th century
3
Republic, 1836-1846
3
1865-1950
2
1908-1973
2
1917-1963
2
Cretaceous
2
To 1846
2
1789-1851
1
1820-1888
1
1830-
1
1838-1915
1
1845-1849
1
1846-1950
1
1849-1853
1
1909-1913
1
1913-1921
1
1917-1993
1
1929
1
1933-1945
1
1933-2010
1
1941-1966
1
1945-1989
1
1951-
1
1959-1993
1
1961-1963
1
1963-1969
1
1964-
1
1971-
1
1973-2020
1
21st century
1
Carboniferous
1
Devonian
1
Guerra con EE. UU., 1845 1848
1
Guerra con México, 1845 1848
1
Jurassic
1
Paleozoic
1
Revolution, 1910-1920
1
Soviet occupation, 1979-1989
1