Era
20th century
210
19th century
135
21st century
112
1945-1989
83
1989-
78
18th century
76
1946-
61
1900-1999
57
1800-1899
38
1775-1783
36
1783-1865
36
2000-2099
36
2017-
33
2009-2017
31
2001-2009
30
Since 1900
30
Revolution, 1775-1783
26
1980-
25
1933-1945
21
1815-1861
20
1945-
20
1783-1809
17
1861-1865
17
1960-1980
17
Civil War, 1861-1865
17
To 1865
17
1809-1865
14
1945-1953
14
2017-2021
14
Since 2017
14
1993-2001
13
2016
13
Since 2000
13
1961-1969
12
To 1775
12
1970-
11
1981-1989
10
Since 1989
10
1700-1899
9
1789-1815
9
1917-1963
9
1951-
9
Since 1945
9
1700-1799
8
1865-1900
8
1865-1933
8
1913-1994
8
1953-1961
8
1732-1799
7
1809-1817
7
more ...