What are mound builders know for?

Mound builders are known for the various cultures collectively termed "Mound Builders" were inhabitants of North America who, during a 5,000-year period, constructed various styles of earthen mounds for religious, ceremonial, burial, and elite residential purposes.

Explanation:

Mound Builders were inhabitants of North America who, over a period of 5,000 years, built various styles of clay mounds for residential and religious purposes. ... Since the 19th century, the predominant academic consensus has been that the hills were built by indigenous peoples of the Americas.

b. would be the answer if not try c

hope this correct me if my answer is wrong if i am correct can you plz give me brainliest

: ) : 0 : o : d

explanation:

climate change is the big reason to the decline of the indus valley which also caused floods. so i dont know what answer would best fit the description thats just what i found online! have an awesome