John Work, J. J. Warner, and the Native American Catastrophe of 1833

In 1833 the Native American population of California9s Central Valley was decimated by an epidemic variously identified as remittent fever, cholera, typhus, or malaria. This article confirms that it was malaria introduced by the Hudson9s Bay Company fur brigade led by John Works, based on the conjunction of weather, carriers,a nd contact and on the eyewitness accounts of Works, George Yount, and J.J. Warner. The Indian9s catastrophe contributed to the American colonial conquest of the region.