Era
1945-1989
91
20th century
87
1989-
70
1865-1950
51
1951-
51
1775-1865
31
19th century
28
1815-1861
23
1900-1999
23
Civil War, 1861-1865
22
Since 1945
21
1925-1968
19
1849-1877
17
1783-1865
16
2001-2009
16
1933-1945
15
1775-1783
13
1908-1957
12
1932-2009
12
1963-1969
12
Since 1951
12
1786-1836
11
1800-1899
11
1943-
11
1946-
11
Since 1900
11
1940-2020
10
1793-1863
9
1861-1865
9
1865-1933
9
1901-1953
9
1945-1953
9
1981-1989
9
1811-1874
8
2009-2017
8
Revolution, 1775-1783
8
To 1865
8
1782-1852
7
1783-1809
7
1808-1873
7
1898-1951
7
1917-1963
7
1959-
7
1961-1963
7
1993-2001
7
21st century
7
1782-1850
6
1818-1902
6
1849-1861
6
1855-1925
6
more ...