Among those who cite higher numbers are David Meltzer, “How Columbus Sickened the New World,” The New Scientist, October 10, 1992, 38–41; Francis L. Black, “Why Did They Die?” Science, December 11, 1992, 139–140; and Alfred W. Crosby Jr., Ecological Imperialism: The Biological Expansion of Europe, 900–1900 (New York: Cambridge University Press, 1986). Lower estimates come from the Smithsonian’s Douglas Ubelaker, “North American Indian Population Size, A.D. 1500–1985,” American Journal of Physical Anthropology, 77(1988), 289–294; and William H. MacLeish, The Day Before America (Boston: Houghton Mifflin, 1994). Henry F. Dobyns, American Historical Demography (Bloomington, Indiana: Indiana University Press, 1976), calculated a number somewhat in the middle, or about 40 million, then subsequently revisited the argument, with William R. Swagerty, in Their Number Become Thinned: Native American Population Dynamics in Eastern North America, Native American Historic Demography Series (Knoxville, Tennessee: University of Tennessee Press, 1983). But, as Nobelist David Cook’s study of Incaic Peru reveals, weaknesses in the data remain; see Demographic Collapse: Indian Peru, 1520–1660 (Cambridge: Cambridge University Press, 1981). Betty Meggers’s “Prehistoric Population Density in the Amazon Basin” (in John W. Verano and Douglas H. Ubelaker, Disease and Demography in the Americas [Washington, D.C.: Smithsonian Institution Press, 1992], 197–206), offers a lower-bound 3 million estimate for Amazonia (far lower than the higher-bound 10 million estimates). An excellent historiography of the debate appears in Daniel T. Reff, Disease, Depopulation, and Culture Change in Northwestern New Spain, 1518–1764 (Salt Lake City, Utah: University of Utah Press, 1991). He argues for a reconsideration of disease as the primary source of depopulation (instead of European cruelty or slavery), but does not support inflated numbers. A recent synthesis of several studies can be found in Michael R. Haines and Richard H. Steckel, A Population History of North America (Cambridge: Cambridge University Press, 2000). Also see Richard H. Steckel and Jerome C. Rose, eds., The Backbone of History: Health and Nutrition in the Western Hemisphere (Cambridge: Cambridge University Press, 2002). The quotation referring to this study is from John Wilford, “Don’t Blame Columbus for All the Indians’ Ills,” New York Times, October 29, 2002.
Technology and disease certainly played prominent roles in the conquest of Spanish America. But the oppressive nature of the Aztecs played no small role in their overthrow, and in both Peru and Mexico, “The structure of the Indian societies facilitated the Spanish conquest at ridiculously low cost.” 22 In addition, Montezuma’s ruling hierarchical, strongly centralized structure, in which subjects devoted themselves and their labor to the needs of the state, made it easy for the Spanish to adapt the system to their own control. Once the Spanish had eliminated Aztec leadership, they replaced it with themselves at the top. The “common people” exchanged one group of despots for another, of a different skin color.
By the time the Aztecs fell, the news that silver existed in large quantities in Mexico had reached Spain, attracting still other conquistadores. Hernando de Soto explored Florida (1539–1541), succeeding where Juan Ponce de León had failed, and ultimately crossed the Mississippi River, dying there in 1542. Meanwhile, marching northward from Mexico, Francisco Vásquez de Coronado pursued other Indian legends of riches in the Seven Cities of Cibola. Supposedly, gold and silver existed in abundance there, but Coronado’s 270-man expedition found none of the fabled cities, and in 1541 he returned to Spain, having mapped much of the American Southwest. By the 1570s enough was known about Mexico and the Southwest to attract settlers, and some two hundred Spanish settlements