The post-contact population collapse of the Americas

Assembled from 25 blocks · 4 evidence · 31 related

1. Story
2. The largest demographic catastrophe in the recorded human past, and the limb of the Columbian Exchange that ran in only one direction. Populations of the Americas had been separated from Afro-Eurasian disease pools for millennia and had no acquired or inherited resistance to smallpox, measles, typhus, influenza or, later, yellow fever and malaria. Epidemics repeatedly preceded the Europeans who carried them, moving along existing indigenous trade and communication networks, so that many societies were already collapsing when they were first described — which is one reason early European accounts systematically under-record what was there before. Modern reconstructions using colonial tribute records, archaeology, land-use proxies and ethnohistory converge on a pre-contact population of tens of millions falling by something close to ninety per cent within about a century. Two cautions belong in the same breath. Disease was not the whole mechanism: warfare, enslavement, forced relocation, the destruction of food systems and the collapse of the social capacity to care for the sick all multiplied mortality, and a purely epidemiological account quietly removes human agency from the record. And the numbers are estimates with wide bounds, not counts.
3. Knowledge
4. The Columbian Exchange
5. The post-contact population collapse of the Americas
6. Connections
7. The Columbian Exchange
8. The transatlantic slave trade
9. The 1610 CO₂ minimum ("Orbis spike")
10. Smallpox reaches Tenochtitlan
11. Atmospheric CO₂ reaches a minimum recorded in Antarctic ice
12. Earth system impacts of the European arrival and Great Dying in the Americas after 1492
13. Historia general de las cosas de Nueva España (Florentine Codex), Book XII
14. Silver
15. The Atlantic crossing (Carrera de Indias)
16. Potato (Solanum tuberosum)
17. Maize (Zea mays)
18. The post-contact population collapse of the Americas
19. Maize appears in Chinese local records
20. A documented consignment of potatoes reaches Europe
21. Evidence
22. Supports the reconstruction of pre-contact American population, the scale of post-contact decline, the area of farmland abandoned and the resulting drawdown of atmospheric CO₂. V55 verification basis: NOT consulted in this session — no network access was available. The Journey declaration itself cites this paper as "Quaternary Science Reviews 207, 13", which corroborates the volume but is not independent confirmation. Every figure this pack attributes to it is flagged in the citing object's `missing` list as requiring a check against the paper.
23. The standard survey of competing estimates of pre-contact American population, and the source of the mid-range consensus figure customarily quoted against the much higher and much lower estimates in the literature. V55 verification basis: NOT consulted in this session. Cited here for the RANGE of estimates rather than for any single number, which is the honest use of it given that no figure could be checked.
24. Contemporary Nahua testimony describing the 1520 smallpox epidemic in Tenochtitlan from within the city. V55 verification basis: NOT consulted in this session — neither the manuscript nor a published edition was accessible. The description of the epidemic passage is given from the author's knowledge of the Anderson and Dibble translation. Note also that the Codex is a compilation made a generation after the events by informants recalling them, which is a limitation of the source itself and not only of this session.
25. Establishes the biological framing of post-1492 contact — crops, livestock and pathogens moving between hemispheres — used throughout this pack. V55 verification basis: this session had no outbound network access (WebFetch blocked by egress policy, WebSearch budget exhausted), so the book was not consulted; the citation is given from the author's knowledge and the work is a standard, widely held title that a curator can verify in any research library catalogue.