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Hopewell people build mounds for burial grounds.
They had permanently settled into areas.
Adena, Hopewell, and Mississippians
They both build burial mounds
The Mound Builders who were Adena and Hopewell and Mississippian.
they used straw instead of wood as they are cultral and free spirited
The Indian Mound Builders built mounds for elite residential purposes, burials and religious and other ceremonials. The mounds were usually flat-topped pyramids or platform mounds.
how did the hopewell build there houses
The original theory was that they used baskets of dirt, and that may still hold true for smaller mounds. Recent studies show that much more complex methods were required for the larger mounds (although they don't give examples of what that may have been).
building mounds such as the serpent mound
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.
They are earthen mounds.