Every tribe was different, although certain elements were<span> common to most of the </span>Plains tribes<span>. The true Plains peoples </span>were<span> entirely nomadic,.</span>
a) hunter gatherers who built mounds
The various cultures collectively termed "Mound Builders" were inhabitants of North America who, during a circa 5,000-year period, constructed various styles of earthen mounds for religious, ceremonial, burial, and elite residential purposes.
C the decline in ethnics and morality in the suburbs