Era
19th century
8
20th century
6
1914-1918
4
Revolution, 1775-1783
3
Civil War, 1861-1865
2
Revolution (1775-1783)
2
1809-1865
1
1825-1874
1
1847
1
1848-1920
1
1863-1933
1
18th century
1
1911-
1
1914-
1
1917-1945
1
1951-
1
1952-
1
1979-
1
1979-1990
1
1980-
1
1989-
1
Civil War
1
Colonial period, ca. 1600-1775
1
Since 1952
1
Since 1979
1
To 1775
1
War of 1898
1