<P> The Lewis and Clark Expedition from May 1804 to September 1806 , also known as the Corps of Discovery Expedition , was the first American expedition to cross the western portion of the United States . It began near St. Louis , made its way westward , and passed through the Continental Divide of the Americas to reach the Pacific coast . The Corps of Discovery was a selected group of US Army volunteers under the command of Captain Meriwether Lewis and his close friend Second Lieutenant William Clark . </P>
<P> The Lewis and Clark Expedition from May 1804 to September 1806 , also known as the Corps of Discovery Expedition , was the first American expedition to cross the western portion of the United States . It began near St. Louis , made its way westward , and passed through the Continental Divide of the Americas to reach the Pacific coast . The Corps of Discovery was a selected group of US Army volunteers under the command of Captain Meriwether Lewis and his close friend Second Lieutenant William Clark . </P>
who made the first journey by citizens of the united states
who made the first journey by citizens of the united states
Meriwether Lewis William Clark
Meriwether Lewis William Clark