Era
20th century
247
1945-1989
117
19th century
99
1900-1999
93
1989-
87
21st century
62
2001-2009
59
1951-
56
1865-1950
51
2009-
44
1946-
41
Civil War, 1861-1865
38
1800-1899
36
1775-1865
33
1918-1961
33
1971-1981
29
1815-1861
27
Since 1945
26
1849-1877
25
1933-1945
24
1809-1858
22
1925-1968
22
1993-2001
22
To 1865
22
1783-1865
21
Revolution, 1775-1783
21
18th century
17
1948-
16
1775-1783
15
1861-1865
15
1943-
15
1981-2001
15
2000-2099
15
2009-2017
15
World War, 1914-1918
15
1932-2009
14
1981-1989
14
1793-1863
13
1908-1957
13
1963-1969
13
Since 1951
13
1940-
12
1947-2017
12
1786-1836
11
1865-1933
11
1901-1953
11
1945-1953
11
1947-
11
1977-1981
11
2020
11
more ...