Shortly after purchasing the Louisiana territory from France in 1803, President Thomas Jefferson ordered an expedition to explore and map the newly acquired territory and establish an American presence before Britain and other European powers tried to claim it. The campaign's secondary objectives were scientific and economic: to study the area's plants, animal life, and geography, and establish trade with local Native American tribes. To lead the expedition of U.S. Army volunteers, Jefferson chose his personal secretary, Captain Meriwether Lewis, an intelligent and literate man who also possessed skills as a frontiersman. Lewis, in turn, solicited the help of Second Lieutenant William Clark, whose abilities as draftsman and frontiersman were even stronger. Lewis and Clark Met the Nez Perce Before the War Lewis and Clark's expedition began on May 21, 1804, when they and 33 soldiers and others departed from their camp near St. Louis, Missouri. The first portion of the expedition...










