Era
20th century
662
19th century
385
21st century
145
1564-1616
66
Colonial period, ca. 1600-1775
62
1963-1969
59
1812-1870
58
1961-1969
53
1800-1859
48
1945-
47
1946-
47
Civil War, 1861-1865
44
Revolution, 1775-1783
43
To 1863
43
1865-1877
42
18th century
42
1845-1861
41
1933-1945
38
1865-1918
36
2011-2020
35
1865-1921
34
1941-1955
31
17th century
30
1918-1945
30
1937-
24
1952-
23
1783-1865
22
1805-1879
21
1908-1973
18
1944-
18
1934-
17
1941-
17
1942-
17
1955-
17
2000-
17
1951-
16
1963-
16
1949-
15
1966-
15
1967-
15
1770-1827
14
1902-1987
14
1929
14
1943-
14
1960-
14
1961-
14
1984-
14
Civil War, 2011-
14
1839-1926
13
1901-1989
13
more ...