Era
20th century
754
1900-1999
274
19th century
227
21st century
136
2000-2099
71
1800-1899
70
1975-
37
1941-1955
33
Civil War, 1861-1865
32
1800-1999
24
18th century
24
1933-1945
22
1945-1989
21
1877-1964
20
1980-
16
1929-1968
15
1989-
15
1900 - 1999
14
1865-1950
13
1900-2099
13
1993-
13
1861-1865
12
1945-
12
To 1964
12
17th century
11
1868-1963
11
1946-
11
1865-1918
10
2001-2009
10
1924-1987
9
1973-2020
9
Since 1900
9
1835-1910
8
1863-1877
8
1951-
8
Colonial period, ca. 1600-1775
8
Revolution, 1775-1783
8
Since 1975
8
1818-1895
7
1865-1877
7
1919-1972
7
1948-
7
20e siècle
7
1775-1865
6
1809-1865
6
1858-1942
6
1864-1946
6
1901-1981
6
1925-1965
6
2009-2017
6
more ...