Disease and Alcohol
Disease and alcohol did not merely coincide; they converged. The former destroyed the human capital of Northwest societies—the elders, the healers, the diplomats—while the latter degraded the institutional capital, fraying the alliances and leadership structures that might have organized resistance. Together, they produced a condition of structural vulnerability that made the treaty councils of the 1850s less a negotiation between sovereigns than a reckoning with collapse.
North America was isolated for at least 10,000 years. Europeans had developed a degree of immunity to European disease over thousands of years. North America was virgin soil. In Native villages, often everyone fell ill at the same time. Because there were no healthy adults left to forage, chop firewood, haul water, or tend to the sick, a massive percentage of the mortality rate was actually caused by starvation, dehydration, and secondary infections rather than the primary disease itself. Historians and anthropologists estimate that between 1780 and 1900, the overall Indigenous population of the Pacific Northwest declined by 80% to 90%. In certain highly vulnerable geographic zones — specifically the riverine valleys of western Oregon and southwestern Washington — the destruction was nearly total, with documented population losses reaching as high as 95% to 97% by the mid-19th century.
The introduction of distilled alcohol to the Pacific Northwest during the late eighteenth and nineteenth centuries functioned as a highly disruptive catalyst that altered regional trade, social structures, and diplomacy. Initially, many Indigenous communities were drawn to high-proof spirits not merely for casual consumption, but because the intense, altered states of intoxication were occasionally integrated into existing cultural and spiritual frameworks associated with vision quests and the spirit world. Recognizing the immediate threat this posed to regional stability and the Indigenous workforce, corporate entities like the Hudson’s Bay Company — under Chief Factor John McLoughlin — enforced strict “dry” monopolies across the interior to protect fur yields, while prominent Plateau leaders like Chief Kamiakin fiercely advocated for total abstinence and later mandated strict anti-liquor clauses directly into the treaties of 1855 to secure reservation borders. Despite these internal and external restrictions, independent American “whiskey peddlers” and land speculators systematically flooded the region with low-grade frontier liquor, intentionally weaponizing intoxication during trade and treaty negotiations to cloud judgment, create debilitating economic dependencies, and manipulate tribal leaders into signing away millions of acres of ancestral homelands.