How did European diseases affect Indigenous people living in California after contact with colonizers?

The arrival of European colonizers in California introduced a suite of infectious diseases to which Indigenous populations had no prior exposure or immunity. These pathogens, which included smallpox, measles, and scarlet fever, had devastating consequences, wiping out large portions of the Indigenous population in a relatively short period.12

The impact of these diseases was exacerbated by the broader context of colonization. Indigenous peoples were often forced into missions, where they were subjected to labor, displacement, and social disruption. These conditions, combined with the lack of immunity, created a catastrophic demographic collapse. While scholars debate the exact scale of population loss across North America, it is widely recognized that the introduction of these diseases—often compounded by secondary factors like famine, violence, and displacement—resulted in extraordinary levels of mortality.1234

It is a fundamental ethical imperative to acknowledge the profound suffering and loss of life experienced by Indigenous peoples due to these colonial practices, which fundamentally altered the course of their history and culture.4