Why did Spain want to conquer the Aztecs? because the Aztec empire was small and weak because Spain already had control over that area because the Aztec empire had large amounts of territory

because the Aztec empire had large amounts of territory

Explanation:

The Aztecs had tons of land and their trades were better because the had more land to produce more. Sense, they produced so much stuff, Spain wanted to accumulate a trade system. They didn' truly want to take their empire over, but in the end that seemed to be the only way.

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

the answer is a) high entry costs