The Indians
The expedition encountered nearly 50 different Native American Tribes along their journey. Each tribe was greeted with a "meeting ceremony." This ceremony consisted of the captains explaining to the tribal members that their land now belonged to the United States. They also stated that President Thomas Jefferson was to be their new "Great Father." They would give the Indians a peace medal. Then they performed a type of parade, which consisted of marching and shooting their guns. The corps learned that many of the Indian tribes they encountered along their journey were vastly different. Yet, all of the Indian tribes played an important role in the expedition.
Here is some useful information on the most important tribes that Lewis and Clark encountered on the expedition.
The Missouri
http://www.pbs.org/lewisandclark/native/idx_mis.htmlThe Oto
http://www.pbs.org/lewisandclark/native/idx_oto.htmlThe Yankton Sioux
http://www.pbs.org/lewisandclark/native/idx_yan.htmlThe Teton Sioux
http://www.pbs.org/lewisandclark/native/idx_tet.htmlThe Arikara
http://www.pbs.org/lewisandclark/native/idx_ari.htmlThe Mandan
http://www.pbs.org/lewisandclark/native/idx_man.htmlThe Hidatsa
http://www.pbs.org/lewisandclark/native/idx_hid.htmlThe Assiniboin
http://www.pbs.org/lewisandclark/native/idx_ass.htmlThe Blackfeet
http://www.pbs.org/lewisandclark/native/idx_bla.htmlThe Shoshones
http://www.pbs.org/lewisandclark/native/idx_sho.htmlThe Nez Perce
http://www.pbs.org/lewisandclark/native/idx_nez.htmlThe Walla Walla
http://www.pbs.org/lewisandclark/native/idx_wal.htmlThe Wishram
http://www.pbs.org/lewisandclark/native/idx_wis.htmlThe Tillamook
http://www.pbs.org/lewisandclark/native/idx_til.htmlThe Clatsop
http://www.pbs.org/lewisandclark/native/idx_cla.htmlThe Chinook
http://www.pbs.org/lewisandclark/native/idx_chi.html