20th century 8,209
1900-1999 2,779
19th century 2,713
21st century 1,226
1900 - 1999 1,067
To 1846 1,023
1846-1850 908
1850-1950 639
1800-1899 566
1951- 520
2000-2099 498
20e siècle 403
Civil War, 1861-1865 263
18th century 239
Tertiary 229
1947- 218
1800 - 1899 206
Miocene 203
1939-1945 202
1950- 177
Pleistocene 176
1713-1784 175
Since 1951 170
Cenozoic 168
Quaternary 158
Pliocene 145
20e siècle 142
1944- 138
1934- 137
1800-1999 136
1900-2099 136
Cretaceous 136
1991 133
1961-1970 123
1970 123
1971-1980 120
1902-1968 115
1945- 114
1990 110
21e siècle 110
1994 109
1850 108
1803-1880 107
1927-1993 106
From 2 to 65 million years ago 104
1989 103
1992 101
Eocene 101
1861-1865 99
1946- 98
1929 97
1943- 97
1938- 96
1988 95
1906 89
1954- 89
1824-1893 84
1813-1890 82
1985 82
1980 81
1987 80
From 10 thousand to 2 million years ago 80
1984 79
From 10 to 25 million years ago 78
1846 - 1850 77
1929- 76
1941- 76
1937- 75
1949- 75
1965 75
To 1848 75
1951-1960 74
1882-1942 73
1930- 73
1971 73
1983 73
1939 - 1945 72
1952- 72
1961-1975 72
2000 - 2099 72
1969 71
From 65 million years ago 71
1972 69
1838-1914 68
California 68
-1853 66
1936- 66
1967 66
1993 66
1948- 65
1982 64
1933- 63
1981 63
19e siècle 63
1867-1959 62
1968 62
1979 62
1935- 61
1942- 61
1905-1996 60