A. voters in all states vote to approve the amendment. b. 2/3 a both houses of Congress propose the amendment.
c. the Senate approve the amendment.
d. 3/4 of State legislatures ratify the amendment

b. 2/3 a both houses of Congress propose the amendment.

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