U.S. President Thomas Jefferson had been planning…
1804 CE
He charges Lewis and Clark to "explore the Missouri River, and such principal stream of it, as, by its course and communication with the waters of the Pacific Ocean; whether the Columbia, Oregon, Colorado or any other river may offer the most direct and practicable communication across the continent for the purposes of commerce". (Donald William Meinig: The Shaping of America: A Geographical Perspective on 500 Years of History: Volume 2: Continental America, 1800–1867. (1995). Yale University Press. p. 65.)
Jefferson also instructs the expedition to study the region's native tribes (including their morals, language, and culture), weather, soil, rivers, commercial trading, animal and plant life.