20th century 10,805
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19th century 5,157
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21st century 2,684
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18th century 1,576
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1564-1616 1,011
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Civil War, 1861-1865 984
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17th century 964
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1945- 884
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Cretaceous 838
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1945-1989 741
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16th century 586
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1933-1945 551
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Revolution, 1775-1783 517
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1946- 489
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1989- 483
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Tertiary 446
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To 1500 435
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Quaternary 415
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2009- 408
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2001-2009 388
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Early modern, 1500-1700 383
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Colonial period, ca. 1600-1775 370
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1991- 348
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Precambrian 346
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Paleozoic 334
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Cenozoic 293
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1960- 279
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1951- 272
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2000- 260
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1929 250
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Permian 249
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1809-1865 239
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Eocene 235
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1918-1945 225
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1993-2001 223
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Jurassic 223
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Mesozoic 216
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1981-2001 213
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1949- 210
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Pennsylvanian 206
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Miocene 201
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1947- 193
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Pleistocene 193
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1948- 191
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Ordovician 189
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1961-1970 187
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Devonian 174
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1979- 169
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1945-1953 168
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1991-2000 168
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1950- 167
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1882-1945 165
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-1400 164
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1608-1674 164
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1917-1963 164
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Mississippian 164
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1980- 161
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1882-1941 158
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1952- 158
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1990- 153
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1783-1865 148
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1953-1961 148
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Triassic 148
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1969- 145
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1965- 144
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1970- 144
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1959- 137
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1812-1870 136
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1954- 135
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1981-1989 135
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Civil War, 2011- 135
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2001- 133
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1993- 130
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Middle English, 1100-1500 129
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1866-1895 127
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1956- 125
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1724-1804 124
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1913-1994 124
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To 1775 124
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1897-1962 123
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Cambrian 123
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1958- 120
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1951-1960 118
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World War, 1939-1945 118
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1775-1865 117
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1819-1891 117
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2003- 117
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Revolution, 1789-1799 117
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1975- 116
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1775-1783 115
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1961- 115
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1997- 115
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Holocene 115
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Pliocene 114
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1743-1826 113
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1941- 112
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1942- 112
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1960-1980 112
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1843-1916 110
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1964- 109
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