History of Native
Americans
Until Civil War 41
verely depleted in much of the region, and Indians were often forced to
turn to the traders for imported food, thereby compounding their depen-
dence. British and French traders frequently took Indian wives.
The influx of Europeans brought a new round of devastating "virgin
soil" epidemics to western North America. As much as one-third of the
previously unexposed populations in the Plains, the Southwest, and other
regions during the 1780s were struck down by smallpox, supplemented
by localized outbreaks of influenza and other diseases.
The epidemics, along with the advent of the Americans after the Louisi-
ana Purchase, marked a major turning point in Indian relations with Euro-
Americans in the Plains (from the Missouri Valley southward) and Colum-
bia regions. Several expeditions, beginning with that of
Lewis
and Clark
(1804-6), reported in great detail on the land, resources, and peoples of
the Missouri and Columbia drainages, encouraging entrepreneurs to take
advantage of American sovereignty in this fur-rich region. Thereafter,
trading parties took pack trains of goods directly to Indian villages, in-
stead of waiting for middlemen to bring pelts to company posts. In some
areas,
American-employed trappers of many backgrounds including
whites, Metis, eastern Indians (principally Iroquois, Delawares, and Shaw-
nees),
and even native Hawaiians procured their own pelts rather than
trading with the local natives. Traders also dispensed guns for their clients
to use in the growing competition for hunting territories. The spread of
trade and warfare heightened Indian demand for horses for the mobility
they provided in raids. On the Missouri, these developments favored the
nomadic Sioux over the village-dwelling Mandans, Arikaras, and
Hidatsas. The latter's large, settled populations were more vulnerable to
epidemic mortality and raids by equestrian nomads, and their middleman
positions were undermined by the nomads' mobility. The Americans estab-
lished amicable relations with Indians as far up the Missouri as the Yel-
lowstone River during this period; the Blackfeet and other groups farther
upriver remained hostile.
The epidemics of the 1780s were equally devastating in the southern
Plains and in the Southwest, leading the Comanches, Utes, Navajos, and
Jicarilla Apaches to make peace with Spain during that decade. Thereafter,
western Apaches were the principal raiders of Spanish and Pueblo commu-
nities.
Although ravaged by drought as well as smallpox, the Hopis
continued to resist Spanish authority. Spain's deteriorating position in the
Americas generally, the growing influx of American and British interlop-
ers in the southern Plains, the devastating epidemics, and the advent of
Cambridge Histories Online © Cambridge University Press, 2008