What was the goal for the corps of discovery?

1. Explore the Missouri River to its source, cross the Rocky Mountains, and seek a westward-flowing river to the Pacific Ocean—the fabled Northwest Passage.
2. Report on new animals, plants, minerals, etc. in the newly-acquired regions.
3. Establish trade with the Native American tribes they encountered.
4. Assure the Native Americans of the peaceful intentions of the United States government. 

Political forces often influence public opinion.