Era
1945-
24
20th century
20
1981-2001
15
1945-1989
11
21st century
11
2001-2009
9
1971-1981
7
1989-
7
Civil War, 1861-1865
6
2009-2017
4
1961-1971
3
1981-1989
3
1993-2001
3
1861-1865
2
1918-1945
2
1926-1945
2
1970-
2
1981-1993
2
19th century
2
2001-
2
1783-1865
1
1854-1912
1
1919-1933
1
1933-1945
1
1941-
1
1946-
1
1949-
1
1965-
1
1979-
1
1980-2020
1
1981-
1
1989-1993
1
2009-
1
2016
1
Siglo XX
1