Era
20th century
3,672
19th century
1,533
1900-1999
1,011
1809-1865
721
Civil War, 1861-1865
689
1800-1899
375
21st century
345
1900 - 1999
335
1951-
294
1861-1865
241
To 1865
185
Since 1951
184
2000-2099
182
1990
168
1778-1865
159
1875-
151
1800 - 1899
143
20e siècle
142
1867-1959
139
1865-1950
128
1886
125
To 1875
119
Pennsylvanian
113
1961-1970
110
To 1950
109
1800-1999
104
1951-1960
94
1805-1844
93
Since 1875
89
1861 - 1865
86
To 1778
86
1813-1861
82
1941-1950
74
1899-1947
68
1802-1837
64
1860-1935
61
1931-1940
61
18th century
60
19e siècle
58
1905-1936
55
20e siècle
55
1858
54
1855-1887
53
1904-1971
53
1900-1965
51
1929
51
Mississippian
51
1857-1861
50
1800 - 1999
47
Pleistocene
47
more ...