2. TThe Lewis and Clark Expedition, also known as the Corps of Discovery Expedition was the first American expedition to cross what is now the western portion of the United States, departing from St. Louis on the Mississippi River making their way westward through the continental divide to the Pacific coast.

3.  The expedition was prepared with sufficient black powder and lead for their flintlock firearms, knives, blacksmithing supplies, and cartography equipment. They also carried flags, gift bundles, medicine and other items they would need for their journey. Much time went into ensuring a sufficient supply of these items.

4.  Lewis began the expedition on August 30, 1803 in Pittsburgh PA. Lewis invited Clark on the expedition weeks later on October 13, 1803. The expedition then ended on September 23, 1806 upon their return to St. Louis from Oregon.  Lewis’s expedition began in Pittsburgh, and it took 2 years and 25 days.  Clark’s part of the expedition took 1 year 11 months and 11 days.

5.  As they traveled, Clark spent most of his time on the keelboat, charting the course and making maps, while Lewis was often ashore, studying the rock formations, soil, animals, and plants along the way.

6.  In addition, the expedition established relations with the Native Americans in the region, one of President Jefferson's main goals. Aside from the confrontation with the Teton Sioux, these relations were largely peaceful and the Corps received extensive help from the various tribes they met regarding things like food and navigation.