How was Lewis and Clark's exploration of the Missouri River important for westward expansion?
A.
Settlers could more easily travel from St. Louis down to New Orleans.
B. Lewis and Clark ran the first successful steamboat on the Missouri River.
C. The waterway became a major route for people to move west.
D.
It gave settlers a route across the Appalachian Mountains.

C

Explanation:

I would say C because any water way back then was really important because it was faster and more useful. Water ways were faster ways to import and export goods. So, finding a water source was really important for people moving into the west.

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