Era
19th century
178
20th century
145
18th century
65
21st century
43
1900-1999
39
1800-1899
35
1980-
22
17th century
20
2000-2099
20
1945-
19
Revolution, 1775-1783
16
1975-
15
To 1500
15
Civil War, 1861-1865
13
1700-1799
12
To 1865
12
1775-1865
9
1800-1999
9
Colonial period, ca. 1600-1775
9
Revolution, 1789-1799
9
Since 1945
9
1980-2020
8
To 1775
8
1801-1917
7
16th century
6
1821-1865
6
1865-1918
6
1865-1950
6
1917-1945
6
1918-1933
6
1951-
6
1960-1980
6
1989-
6
To 146 B.C.
6
1600-1868
5
1898-1951
5
1945-1989
5
1947-
5
1991-
5
Since 1980
5
Victoria, 1837-1901
5
1066-1485
4
1775-1783
4
1775-1817
4
1810-1865
4
1818-1883
4
1837-1901
4
1861-1865
4
1867-1910
4
1894-1962
4
more ...