Era
20th century
13
1945-
4
19th century
4
1865-1918
3
1945-1953
2
1960-1980
2
1964-1975
2
1975-
2
1980-
2
1775-1865
1
1809-1865
1
1856-1929
1
1865-1921
1
1884-1972
1
19
1
1900-1999
1
1909-
1
1918-1932
1
1933-1945
1
1964-
1
1969-
1
1980
1
1981-
1
1981-1989
1
1989-
1
Civil War, 1861-1865
1
World War, 1914-1918
1
world War, 1914-1918
1