TIMED TEST During the Civil War, .
A. the Five Tribes remained neutral
B. the Five Tribes allied themselves with the Confederacy
C. the Cherokee allied with the Union, while the other tribes allied with the Confederacy
D. the Five Tribes allied themselves with the Union

it's six tribes not five

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

c, because the american revolution was from 1765 to 1783.