Between 1492 and the mid-seventeenth century the indigenous population of the Americas fell catastrophically, and the size of that fall depends almost entirely on an unobservable starting figure. The published estimates for 1492 span more than an order of magnitude, from Kroeber's 8.4 million and Rosenblat's 13.4 million at one end to Dobyns's 90-112 million at the other, with Denevan's roughly 54 million and Koch and colleagues' roughly 60 million occupying the middle. Nearly all specialists agree that imported epidemic disease — smallpox, measles, typhus, influenza — was the largest single killer, because it struck populations with no prior exposure and repeatedly, but Newson and others argue that disease cannot be treated as an independent variable: mortality was highest where conquest, enslavement, forced labour in mines and fields, tribute exaction, forced resettlement and the destruction of food systems left populations unable to care for the sick, and falling fertility then prevented recovery. Some regions were emptied within a generation, others declined slowly, and a few populations stabilised and grew again. Because the figure has become politically charged, this atlas gives the range and the scholars attached to each end rather than adopting a single number.
European colonisation of the Americas was followed by a population collapse whose causes — imported epidemics, war, enslavement, forced labour and the destruction of subsistence systems — are weighted differently by different scholars
There is no census. Modern reconstructions from carrying-capacity models, early colonial tribute and mission counts and archaeological survey range from about 40 million to over 100 million; Denevan's widely used consensus figure is roughly 54 million, and Koch and colleagues (2019) model about 60 million. Lower-end estimates (Ubelaker, Rosenblat) fall below 15 million for some regions, so the figure carries an uncertainty of tens of millions.
The bounds are not a measurement but the consequence of the disputed baseline. A minimalist starting population of the Rosenblat or Kroeber type implies a loss on the order of ten million; Denevan's roughly 54 million and Koch's roughly 60 million imply losses in the tens of millions; Dobyns's figures imply a loss approaching one hundred million. The overwhelming majority of these deaths are attributed by nearly all scholars to imported epidemic disease rather than to direct killing, but Newson and others insist the epidemics acted on populations already broken by conquest, enslavement, forced labour and famine, so the categories cannot be cleanly separated.
Newson's survey documents systematic killing, enslavement and ill treatment under the early encomienda and the mine labour drafts as contributory causes of the decline alongside epidemic disease, and these forms are recorded in the Spanish crown's own inquiries and in mission and tribute records.
Mexico