Era
1945-
49
1991-
42
20th century
41
1989-
40
1945-1989
29
1971-1981
24
1971-
19
Civil War, 1861-1865
18
1981-2001
17
1981-1993
16
1981-
15
1985-1991
15
Since 1945
15
21st century
13
1976-2000
12
1980-
11
1986-
11
Since 1971
11
1975-
10
1992-
10
1993-2001
10
1973-1993
9
1990-
9
Since 1991
9
1900-1999
8
1976-
8
1981-1989
8
1980-1989
6
1980-1992
6
1988-
6
2000-
6
2001-2009
6
1900 - 1999
5
1931-2022
5
1948-
5
1967-1995
5
1969-1974
5
1979-
5
1908-1979
4
1960-
4
1961-1971
4
1970-1994
4
1974-1977
4
1975-1979
4
1988-2000
4
1989-1993
4
1993-
4
Since 1976
4
Since 2000
4
1917-1963
3
more ...