Amajor goal and outcome of the sibley expedition involved
a. collecting soil samples of the great plains
b. claiming oklahoma land for the united states
c. establishing peaceful relations between americans and important american indian tribes
d. demonstrating that the great plains had rich mineral deposits to mine

D is the correct option.

Explanation:

Sibley expedition was led by George Champlin Sibley. During the expedition, he was with interpreters and Osage scouts on an expedition for two and a half months. It aimed to improve relations between the pawnee and the Kansa and examining the hunting grounds of the Osage. It visited the Kansa village which was located on Kansas river and met he Pawnees on the Platte River. After this, the party turned towards the south.

i think your answer there is c

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )