Example image of eyePlorer eyePlorer map for 'Lewis and Clark Expedition': Pacific coast United States Meriwether Lewis Sacagawea Toussaint Charbonneau William Clark (explorer) Louisiana Purchase Territorial changes of the United States Alexander Mackenzie (explorer) Arctic Ocean Continental Divide of the Americas Narváez expedition Álvar Núñez Cabeza de Vaca West Coast of the United States France President of the United States Thomas Jefferson United States Congress Pacific Northwest Louis XVI of France John Paul Jones Botany Bay James Cook John Ledyard Russia Siberia Catherine II of Russia Poland Botany French Canadian Geology Native Americans in the United States Terrain United Kingdom of Great Britain and Ireland Second Lieutenant United States Army Pacific Ocean Illinois Territory Camp Dubois Hartford, Illinois Missouri River Saint Charles, Missouri Kansas City, Missouri Omaha, Nebraska Appendicitis Charles Floyd (explorer) Floyd's Bluff Iowa Sioux City, Iowa American Bison