20th century 10,901
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19th century 5,185
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21st century 2,730
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18th century 1,583
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Civil War, 1861-1865 991
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17th century 973
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1945- 886
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1564-1616 848
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Cretaceous 838
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1945-1989 748
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16th century 591
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1933-1945 553
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Revolution, 1775-1783 519
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1989- 484
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1946- 482
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Tertiary 447
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To 1500 441
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Quaternary 417
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2009- 408
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2001-2009 389
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Early modern, 1500-1700 385
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Colonial period, ca. 1600-1775 372
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1991- 349
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Precambrian 346
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Paleozoic 334
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Cenozoic 293
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1960- 278
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1951- 268
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2000- 261
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1929 252
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Permian 250
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Eocene 235
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1918-1945 228
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Jurassic 225
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1993-2001 223
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1981-2001 217
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Mesozoic 216
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1949- 210
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Pennsylvanian 206
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Miocene 201
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1809-1865 200
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Pleistocene 193
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1947- 191
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1961-1970 189
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Ordovician 189
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1948- 185
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Devonian 174
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1991-2000 172
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1979- 171
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1945-1953 168
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1950- 165
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Mississippian 164
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1980- 162
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1952- 154
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1990- 154
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1783-1865 148
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1882-1945 148
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1953-1961 148
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Triassic 148
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1970- 146
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1969- 145
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1965- 143
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1917-1963 138
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1959- 136
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Civil War, 2011- 136
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1981-1989 135
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2001- 133
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1993- 130
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Middle English, 1100-1500 130
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1866-1895 128
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To 1775 124
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1954- 123
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Cambrian 123
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1951-1960 121
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1956- 120
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1608-1674 118
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World War, 1939-1945 118
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-1400 117
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1775-1865 117
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1958- 117
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2003- 117
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Revolution, 1789-1799 117
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1997- 116
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1775-1783 115
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1882-1941 115
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1975- 115
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Holocene 115
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Pliocene 114
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1961- 113
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1913-1994 112
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1960-1980 112
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1941- 109
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1964- 109
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1981-1990 109
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Middle Ages, 600-1500 109
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Early church, ca. 30-600 108
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1944- 107
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1942- 106
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1955- 105
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1724-1804 104
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