Laws in the south witch confirmed the belief that slaves were property and should be protected by the public were called

i do belive they were calles slave codes

They were called slave codes

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

you didn't post an image.