GLCEventLouisiana PurchaseQvCNoteFUnited States acquires most of Montana in the Louisiana Purchase. \http://www.thingstodo.com/states/MT/history.htm Taken from the Internet, December 27, 2001.Lewis and Clark ExpeditionwzA hopeful Thomas Jefferson sent Captains Meriweather Lewis and William Clark to find the fabled River of the West. The Northwest Passage was not Jefferson's only priority. In fact, of the tasks assigned them, Lewis and Clark accomplished the most within the modern borders of Montana. Contact and negotiations with native tribes, the reconnaissance of suitable sites for trading posts and forts, and scientific accounts of the land's plants, animals, and scenic resources were all in keeping with Jefferson's hopes for the expeditionQhttp://www.lewisandclark.state.mt.us/ Taken from the Internet, December 2, 2001.First Trading Post|The first trading post in Montana was established at the mouth of the Bighorn by a trading expedition that Manuel Lisa led up the Missouri from St. Louis.[http://www.factmonster.com/ce6/us/A0859754.html Taken from the Internet, December 2, 2001.%First Attempt at Permanent Settlement StevensvilleRJesuit missionaries established St. Mary's Mission, near what is now Stevensville.nhttp://www.culink96.com/umis/classroom-guide/history/history.html Taken from the Internet, December 26, 2001. Oregon Treaty