Era
1971-1981
48
20th century
44
1945-
29
1971-
19
19th century
16
1993-
14
1989-
13
Revolution, 1775-1783
13
1945-1964
12
1900-1999
11
1939-1945
11
1945-1989
9
1960-1980
8
1973-1993
8
1980-2020
8
Cambrian
7
Since 1945
7
1960-
6
Precambrian
6
Since 1971
6
1846-1848
5
1913-1972
5
1961-1971
5
1974-
5
1980
5
1980-
5
1981-1993
5
Silurian
5
Since 1973
5
1775-1783
4
1840-1914
4
1900 - 1999
4
1939 - 1945
4
1965-
4
1973-
4
1981-
4
1981-1989
4
1982-
4
1991-
4
21st century
4
From 500 to 570 million years ago
4
Since 1974
4
Since 1993
4
1800-1999
3
1914-1918
3
1918-1945
3
1948-
3
1961-1963
3
1975-1985
3
1981-2001
3
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