The Fifteenth Amendment opened up voting rights for some people, but not for
white women.
poor white men.
African American men.
former Confederates.

White woman. White woman did not get rights to vote until the 1920's

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. troops marched forward in close formation against newer, more accurate weapons