Contrary to popular belief, the expedition DID NOT begin in St. Louis, Missouri. The first entry in the Lewis and Clark Expedition Journals state that their journey began in Pittsburgh, PA. It is true, Lewis and Clark did begin their journey in Pittsburgh.
If you still don't believe me, check the related link below. It leads to a copy of the original journals online. And as we all know, the common American history textbook likes to smudge the details and cannot always be accepted as fact.
Tecumseh
1863
Chief Keef
Kansa