20th century 3,920
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19th century 1,945
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21st century 1,066
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18th century 462
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Civil War, 1861-1865 453
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1564-1616 359
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17th century 271
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Revolution, 1775-1783 237
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1946- 220
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1945- 184
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1961-1970 180
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Cretaceous 174
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1991-2000 167
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1933-1945 166
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1945-1989 157
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2009- 156
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Quaternary 144
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1929 133
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16th century 123
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Colonial period, ca. 1600-1775 120
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1809-1865 116
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1951-1960 113
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1981-1990 100
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Early modern, 1500-1700 99
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1951- 98
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2001-2010 91
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1971-1980 89
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1989- 82
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1970- 76
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1960- 75
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Paleozoic 75
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1959- 71
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1991- 69
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1882-1945 67
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1948- 67
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Precambrian 67
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Tertiary 67
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1949- 65
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1965- 65
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Civil War, 2011- 63
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1950- 62
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2016 62
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1858-1919 60
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1917-1963 60
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1941- 58
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1732-1799 57
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1954- 57
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1947- 56
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1952- 56
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2001-2009 56
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1913-1994 55
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1981-2001 55
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To 1500 52
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1945-1953 48
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1812-1870 47
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1956- 47
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1882-1941 46
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1890-1969 46
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Jurassic 46
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1884-1972 45
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Cenozoic 45
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1944- 44
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1953- 44
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1839-1876 43
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1967- 43
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1874-1965 42
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1929-1968 42
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1980- 42
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Mesozoic 42
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1770-1827 41
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1856-1924 41
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1866-1895 41
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1889-1945 41
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1897-1962 41
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1931-1940 41
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1938- 41
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1706-1790 40
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1899-1961 40
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1934- 40
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1935- 40
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1879-1955 39
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1955- 39
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1775-1783 38
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1775-1817 38
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1918-1945 38
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1921-1930 38
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1941-1950 38
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1942- 38
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1957- 38
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1977- 38
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