The North American Mound Builders constructed earthen mounds; the mounds of the Ohio River valley served as graves, and other mounds served as temples, such as those in Illinois.
The answer is is the first one: They had expedient ways of burying their dead
<span>"B. Americans who believed in Manifest Destiny wanted to spread the American way of life" is the best answer. President Polk was a major proponent of Manifest Destiny. </span>