On May 14, 1804, the expedition began with Mariwether Lewis who was a military colonel and was chosen by Thomas Jefferson to lead an expedition to explore the West and find the Pacific Ocean. As soon as he was given this task, he turned to a close friend, William Clark who was a mapmaker to join him in the journey.
Spring of 1803
Good afternoon William. Say, would you like to embark in a journey to find the pacific ocean with me?
Of course, my good friend, I would love to join you on a journey to the west.
On July 4, 1803, Thomas Jefferson purchased the Louisiana Territory from France.