Era
1945-
139
21st century
124
2000-2099
55
Since 1945
40
20th century
37
1945-1989
35
1989-
35
1981-2001
34
2001-2009
27
2003-
26
1945-1955
23
1960-
19
1971-1981
19
2001-
17
Civil War, 1861-1865
14
1900-1999
13
1934-
12
1961-1975
12
1971-
12
1981-
12
1993-2001
12
1939-1945
11
1981-1989
11
2009-2017
10
1982-
9
Since 2003
9
19th century
8
1949-
7
1961-1971
7
Since 1981
7
1861-1865
6
1918-1945
6
1976-
6
1990-
6
1991-
6
2009-
6
Since 1934
6
1946-
5
1949-1976
5
1961-
5
1971-1990
5
1985-1991
5
Since 1960
5
Since 1971
5
Since 1989
5
1926-1945
4
1929
4
1939 - 1945
4
1945-1991
4
1965-
4
more ...