After acquiring new territory from France in the Louisiana Purchase, President Thomas Jefferson wants to find out more about the land and its resources. Jefferson needs to establish an American presence in the region, so he commissions an expedition to discover the most practical route across the western half of the continent. May 14, 1804 - The Corps of Discovery, led by Meriwether Lewis and his close friend William Clark, begins its 8,000 mile journey. Two years, four months and ten days later, Lewis and Clark return home, having met their objectives. They established diplomatic relations and trade with two dozen Native American tribes, who shared their customs and provided critical supplies during their expedition. Lewis and Clark could not have known that their expedition would set in motion an invasion of the West that would eventually displace countless Native Americans from their ancestral homelands all in the name of Manifest Destiny.