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Omohundro Institute of Early American History and Culture Virgin Soil Epidemics as a Factor in the Aboriginal Depopulation in America Author(s): Alfred W. Crosby Source: The William and Mary Quarterly, Vol. 33, No. 2 (Apr., 1976), pp. 289-299 Published by: Omohundro Institute of Early American History and Culture Stable URL: http://www.jstor.org/stable/1922166 Accessed: 09-10-2015 14:48 UTC Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at http://www.jstor.org/page/ info/about/policies/terms.jsp JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. Omohundro Institute of Early American History and Culture is collaborating with JSTOR to digitize, preserve and extend access to The William and Mary Quarterly. http://www.jstor.org This content downloaded from 128.103.149.52 on Fri, 09 Oct 2015 14:48:51 UTC All use subject to JSTOR Terms and Conditions Notes and Documcnts Virgin Soil Epidemics as a Factor in the Aboriginal Depopulation in America Alfred W. Crosby URING the last few decades historianshave demonstratedin- creasing concern with the influence of disease in history, par- ticularly the history of the New World. For example, the latest generation of Americanists chiefly blames diseases imported from the Old World for the disparity between the number of American aborigines in I492 new estimates of which soar as high as one hundred million or ap- proximatelyone-sixth of the human race at that time and the few million pure Indians and Eskimos alive at the end of the nineteenth century.There is no doubt that chronic disease was an important factor in the precipitous decline, and it is highly probable that the greatest killer was epidemic di- sease, especially as manifested in virgin soil epidemics.' Virgin soil epidemics are those in which the populationsat risk have had no previous contact with the diseases that strike them and are therefore immunologicallyalmost defenseless. The importanceof virgin soil epidemics in American history is strongly indicated by evidence that a number of dangerousmaladies smallpox, measles, malaria, yellow fever, and undoubt- edly several more were unknown in the pre-ColumbianNew World.2 In Mr. Crosby is a member of The National Humanities Institute, New Haven, Connecticut, and of the Department of History, Washington State University. He wishes to thank Dauril Alden, Frederick Dunn, Wilbur Jacobs, and William McNeill for their suggestions. 1 Henry F. Dobyns, ''EstimatingAboriginal American Population: An Appraisal of Techniques with a New Hemispheric Estimate," Current Anthropology, VII (i966), 395-449, is an excellent place to begin an examination of this theory. 2 Percy M. Ashburn, The Ranks of Death. A Medical History of the Conquest of America, ed. Frank D. Ashburn (New York, I947); Sherburne F. Cook, "The Significance of Disease in the Extinction of the New England Indians," Human Biology, XLV (I973), 485-508; Alfred W. Crosby,Jr., The Columbian Exchange. Biological and CulturalConsequences of 1492 (Westport, Conn., 1972), 3I-63; Henry F. Dobyns, "An Outline of Andean Epidemic History to I720,"' Bulletin of the History of Medicine, XXXVII (i963), 493-5I5; Frederick L. Dunn, "On the Antiquity of Malaria in the Western Hemisphere," Hum. Bio., XXXVII (i965), 385-393; Robert F. Fortuine, "The Health of the Eskimos, as Portrayed in the Earliest Written Accounts," Bull. Hist. Med., XLV (I97I), 98-II4. This content downloaded from 128.103.149.52 on Fri, 09 Oct 2015 14:48:51 UTC All use subject to JSTOR Terms and Conditions 290 WILLIAM AND MARY QUARTERLY theory, the initial appearanceof these diseases is as certain to have set off deadly epidemics as dropping lighted matches into tinder is certain to cause fires. The thesis that epidemics have been chiefly responsiblefor the awesome diminution in the number of native Americansis based on more than theory. The early chronicles of America are full of reports of horrendousepidemics and steep populationdeclines, confirmedin many cases by recent quantitative analysesof Spanish tribute recordsand other sources.3The evidence provided by the documents of British and French America is not as definitely supportive of the thesis because the conquerors of those areas did not establish permanent settlements and begin to keep continuous records until the seventeenth century, by which time at least some of the worst epidemics of imported diseases had probably already taken place. Furthermore, the British tended to drive the Indians away, rather than ensnaring them as slaves and peons, as the Spaniardsdid, with the result that many of the most important events of aboriginal history in British America occurred beyond the range of direct observation by literate witnesses. Even so, the surviving records for North America do contain references brief, vague, but plentiful to deadly epidemics among the Indians, of which we shall cite a few of the allegedly worst. In i6i6-i6i9 an epidemic, possibly of bubonic or pneumonic plague, swept coastal New England from Cape Cod to Maine, killing as many as nine out of every ten it touched.4 During the i63os and into the next decade, smallpox, the most fatal of all the recurrentIndian killers, whipsawed back and forth through the St. Lawrence-Great Lakes region, eliminating half the people of the Huron and Iroquois confederations.5In I738 smallpox destroyed half the Cherokees, and in I759 nearly half the Catawbas.6During the American Revolution it attacked the Piegan tribe and killed half its members.7 It ravaged the plains tribes shortly before they were taken under United States jurisdictionby the Louisiana Purchase, killing two-thirds of the Omahas and perhaps half the population between the Missouri River and New Mexico.8 In the I820S fever devastatedthe people of the Columbia River area, erasing 3 Wilbur R. Jacobs, "The Tip of an Iceberg: Pre-Columbian Indian Demography and Some Implications for Revisionism," William and Mary Quar- terly, 3d Ser., XXXI (I974), I23-I32, is a good brief introduction to the subject which cites most of the recent works. 4 Cook, "The Significanceof Disease," Hum. Bio., XLV (I973), 487-49I, 497. 5John Duffy, "Smallpox and the Indians of the American Colonies," Bull. Hist. Med., XXV (I95i), 328; Wilcomb E. Washburn, The Indian in America (New York, I975), I05. 6 Duffy, "Smallpox and the Indians of the American Colonies," Bull. Hist. Med., XXV (I95'), 335, 338. Washburn, Indian in America, Ios. 8 E. Wagner Stearn and Allen E. Stearn, The Effect of Smallpox on the Destiny of the Amerindian (Boston, I945), 74-76. This content downloaded from 128.103.149.52 on Fri, 09 Oct 2015 14:48:51 UTC All use subject to JSTOR Terms and Conditions VIRGIN SOIL EPIDEMICS 29I perhaps four-fifths of them.9 In i837 smallpox returned to the plains and destroyed about half of the aborigines there.' Unfortunately, the documentation of these epidemics, as of the many others of the period, is slight, usually hearsay, sometimes dated years after the events described, and often colored by emotion. Skepticismis eminently justified and is unlikely to be dispelled by the discoveryof great quantitiesof first-hand reports on epidemics among the North American Indians. We must depend on analysis of what little we now know, and we must supplement that little by examination of recent epidemics among native Americans. Let us begin by asking why the American aborigines offered so little resistance to imported epidemic diseases. Their susceptibilityhas long been attributed to special weakness on their part, an explanation that dates from the period of colonization, received the stamp of authority from such natural historians as the Comte de Buffon, and today acquires the color of authenticityfrom the science of genetics." In its latest version, the hypothesis of genetic weakness holds that during the pre-Columbianmillennia the New World Indians had no occasion to build up immunities to such diseases as smallpox and measles. Those aborigines who were especially lacking in defenses against these maladies were not winnowed out before they passedon their vulnerabilities to their offspring. Although there is no way to test this hypothesis for pre-Columbian times, medical data on living American ab- origines do not sustain it, and the scientific community inclines toward the view that native Americans have no special susceptibility to Old World diseases that cannot be attributedto environmentalinfluences, and probably never did have."2 9James Mooney, The Aboriginal Population of America North of Mexico, Smithsonian Miscellaneous Collections, LXXX, No. 7 (Washington, D. C., I928), '4. 10 Stearn and Stearn, Effect of Smallpox, 8i-85; Henry R. Schoolcraft, Information Respecting the History, Condition and Prospectsof the Indian Tribes of the United States, Pt. III (Philadelphia, i853), 254. " Henry Steele Commager and Elmo Giordanetti, eds., Was America a Mis- take. An Eighteenth-CenturyControversy (New York, i967), passim. 2 John F. Marchand, "Tribal Epidemics in the Yukon," Journal of the Ameri- can Medical Association, CXXIII (I943), I020; Maurice L. Sievers, "Disease Patterns Among Southwestern Indians," Public Health Reports, LXXXI (i966), I075-io83; Jacob A. Brody et al., "Measles Vaccine Field Trials in Alaska,"Jour. Amer. Med. Assoc., CLXXXIX (i964), 339-342; Willard R. Centerwall, "A Recent Experience with Measles in a 'Virgin-Soil' Population," in Biomedical Challenges Presented by the American Indian, Pan-American Sanitary Bureau, Scientific Publication, No. i65 (Washington, D. C., i968), 77-79; James V. Neel et al., "Notes on the Effect of Measles and Measles Vaccine in a Virgin-Soil Population of South American Indians," AmericanJournal of Epidemiology, XCI (I970), 4i8- 429; interviews with Dr.