Why do cotton and slavery depend on each other

Cotton provided 80% of the raw material to the British industries which was grown by the slaves in America.

Explanation:

During the time of slavery and colonization, there was a famous phase "cotton was the king". Cotton was one of the luxurious commodities that turned millions of black human beings who were slaves in the United States themselves into commodities.

Britain which was the most powerful country of that time depended upon cotton which was 80% raw material for the industries in Britain. It was grown in America by the slaves and a lot of amount was invested in the slaves for the growth of cotton.

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