what was the effect of the lewis and clark expedition?

a. it called for passage of the homestead act

b. it decreased interest in land west of the mississippi river

c. it encouraged westward expansion

d. it creates interest in gold mining in california

C - It encouraged westward expansion.

This is the correct answer.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!