20th century 3,677
19th century 1,535
1900-1999 1,015
1809-1865 721
Civil War, 1861-1865 690
1800-1899 377
21st century 346
1900 - 1999 335
1951- 294
1861-1865 242
To 1865 185
Since 1951 184
2000-2099 182
1990 168
1778-1865 159
1875- 151
20e siècle 144
1800 - 1899 143
1867-1959 139
1865-1950 128
1886 126
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 60
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
1850 44
1900-2099 44
1922-1987 44
1964- 44
1775-1865 43
1921-1930 42
1893 41
1939-1945 41
1902-1976 40
1846-1912 38
1856-1924 37
1871 37
1815-1861 35
1969-1970 35
1886-1969 34
21e siècle 34
Quaternary 34
1865- 32
1945- 32
Devonian 31
1800-1844 30
1915-2004 30
1942- 30
1991-2000 30
From 280 to 310 million years ago 30
Silurian 30
1894 29
1946- 29
1963-1969 28
1816-1897 27
1909-1924 27
1914-1918 27
1956- 27
1980 27
To 1803 27
1845-1861 26
To 1899 26
1849-1861 25
1971-1980 25
Geschichte 25
1786-1868 24
1969 - 1970 24
19e siècle 24
Revolution, 1775-1783 24
To 1931 24
1961-1975 23
1846-1889 22
1848-1887 22
1853-1928 22
1865-1918 22