Era
1945-1989
171
20th century
163
1945-
159
Since 1945
74
1900-1999
64
1933-1945
58
21st century
43
1917-1963
38
1981-1989
37
1945-1953
36
19th century
36
1960-1980
34
1989-
31
1809-1865
27
1969-1974
25
1961-1963
24
1900 - 1999
23
1917-1945
23
1945-1991
23
1960-
23
Revolution, 1775-1783
23
2001-2009
21
Civil War, 1861-1865
21
1775-1783
20
1970-
20
1861-1865
18
1882-1945
17
1918-1945
17
1953-1961
17
1963-1969
17
1993-2001
17
1977-1981
16
1931-2022
15
1975-1985
15
Since 1960
15
2000-2099
14
Colonial period, ca. 1600-1775
14
1743-1826
13
1931-
13
1980-2020
13
1946-
12
1971-
12
To 1867
12
1783-1815
11
1913-1921
11
1969-
11
1991-
11
1732-1799
10
1800-1899
10
1815-1861
10
more ...