Era
20th century
183
19th century
132
18th century
76
1945-1989
61
1900-1999
54
21st century
37
1800-1899
36
1775-1783
35
1783-1865
34
1989-
29
Revolution, 1775-1783
25
Since 1900
24
1946-
22
1815-1861
21
1933-1945
18
1783-1809
17
1861-1865
17
1945-
17
To 1865
17
Civil War, 1861-1865
16
1809-1865
13
1945-1953
13
1960-1980
13
1961-1969
12
To 1775
12
1981-1989
10
2017-
10
1700-1899
9
1789-1815
9
1913-1994
9
1700-1799
8
1865-1900
8
1865-1933
8
1917-1963
8
1969-1974
8
1732-1799
7
1809-1817
7
1882-1945
7
1953-1961
7
1961-1963
7
1980-
7
1993-2001
7
2000-2099
7
1767-1845
6
1783-1815
6
1884-1972
6
1908-1973
6
1775-1865
5
1801-1815
5
1828
5
more ...