Question

the mound builders
anyone who traveled up the mississippi river 900 years ago would have seen, looming in the distance, a four - level mound of earth, built by human hands, that was bigger than egypt’s great pyramid. around this huge mound stood more than a hundred smaller mounds, some topped with walls of wooden poles. canals for irrigation and transportation threaded among fields of maize. wooden houses were covered with red and white plaster. flags of painted animal skin flapped everywhere. this splendid sight was cahokia, home to at least 15,000 native americans.
cahokia stood near the present - day site of st. louis, missouri. in the eighteenth century it was the largest settlement north of the rio grande, and it was also part of a long tradition of mound building in the eastern half of north america. over thousands of years, societies along the mississippi and the rivers that flowed into it, and some in the southeast, constructed tens of thousands of mounds across the land.
make a list of the different structures that the mound builders built. write at least three different structures.

Explanation:

To answer this, we analyze the text about mound builders:

1. The text mentions a "four - level mound of earth" built by human hands. So one structure is the four - level earth mound.
2. It also says "some topped with walls of wooden poles". So wooden - walled mounds (topped with wooden poles) are another structure.
3. There are "canals for fields of maize" mentioned. So canals (for agricultural use, related to mound - building society's infrastructure) are a third structure.

Answer:

1. Four - level mound of earth
2. Mounds topped with walls of wooden poles
3. Canals for fields of maize