Era
20th century
156
19th century
66
1975-
51
21st century
36
1900-1999
23
20e siècle
21
Since 1975
20
Civil War, 1861-1865
16
1980-2020
15
1877-1964
14
1945-1989
14
1989-
11
18th century
10
1980-
10
1863-1877
9
1993-
9
2000-2099
9
21e siècle
8
To 1964
8
1945-
6
1961-
6
1783-1865
5
1861-1865
5
1865-1918
5
1925-1965
5
1929-1968
5
1993-2001
5
19e siècle
5
2001-2009
5
1800-1899
4
1809-1865
4
1924-1987
4
1925-2015
4
1941-1955
4
1947-
4
1964-
4
To 1863
4
1775-1865
3
17th century
3
1818-1895
3
1865-1898
3
1946-
3
1948-
3
1968-
3
1981-
3
2009-
3
Colonial period, ca. 1600-1775
3
Revolution, 1775-1783
3
Since 1980
3
(1961- ...)
2
more ...