Subtle signs suggest to me the people of the Hopewell Interaction Sphere and by extension Adena spoke Caddo-Siouan. I throw Caddo in because that’s the root, but proto-Siouan is a more accurate name for what I’m proposing. That is, Hopewell is the missing Siouan link in a continuum that begins with hunter-gatherers building temples like the one at W…
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