Era
20th century
37
21st century
8
19th century
5
1887-1940
2
1975-
2
1847-1944
1
1856-1915
1
1868-1963
1
1877-1964
1
1890-1948
1
1896-1940
1
1897-1993
1
18th century
1
1901-1989
1
1915-1959
1
1918-1961
1
1924-1987
1
1925-2014
1
1935-
1
1945-1970
1
1945-1989
1
1949-1976
1
1956-
1
1960-1980
1
1961-1969
1
1961-1994
1
1980-
1
1981-2001
1
Civil War, 1861-1865
1
Revolution, 1775-1783
1
Since 1975
1