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Why did disease, warfare, and enslavement cause major population losses among Indigenous South Americans?

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distribution of aboriginal South American and circum-Caribbean cultural groups — South American nomad Distribution of aboriginal South American and circum-Caribbean cultural groups.

The major population decline among Indigenous South Americans following European contact was primarily driven by a combination of introduced diseases, systemic violence, and forced labor.

The Impact of Disease

Before 1492, Indigenous populations lacked immunity to acute infectious diseases common in Eurasia and Africa, such as smallpox, measles, influenza, and malaria. Because these populations had no prior exposure, these pathogens spread as devastating epidemics, causing mortality rates that contributed to a population collapse of 50 to 95 percent in many regions by 1650.12

Warfare and Enslavement

These biological factors were compounded by the physical and psychological stress of colonization. Indigenous peoples faced:2
* Violence and Conquest: Populations along major navigational routes and coastal areas were hit hardest by the direct violence of conquest.34
* Enslavement and Exploitation: Systems such as the encomienda forced Indigenous people into menial servitude. Many died due to the harsh conditions of forced labor, while others were killed during resistance efforts or displaced into marginal hinterlands.354

While some highland communities in the Andes eventually experienced a population resurgence, many other groups were decimated or absorbed into colonial society.364