Every state had some mounds. Some had tens of thousands and a few others only had a hundred or so, and in the Southwest some mounds were made as support for stone structures. This is a brief video of one in Nevada. youtube.com/watch?v=iIqWL1…
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@DrGregLittle2 Wow, that was so cool! Amazing!
@DrGregLittle2 There was one at Chaco Canyon near casa rinconada on the opposite cliff face of natural circular cliff that was artificially modified with a small chamber dug into it called the amphitheater or curved rock that speaks (tse biinaholts’a yalti)