How did lewis and clark contribute to the expansion of the west? a) they mapped the mississippi river for navigators. b) they the united states claim oregon and washington. c) they forced native americans off the land west of the mississippi. d) they negotiated with france for the louisiana purchase?

Lewis and Clark contributed to the expansion of the West by mapping the Mississippi River for other navigators.

Explanation:

After the Louisiana Purchase concluded in 1803, Thomas Jefferson, the then president of the United States appointed Meriwether Lewis and William Clark to explore the lands to the west of the Mississippi River which had recently come under the control of the United States.

Lewis and Clark carried out a crucial expedition of the lands in the west and contributed to the expansion of the west mapping some important regions of the west.

a and b because with the other three, they simplify to something else.