Didn't Native American tribes that lived close to the seacoast trade kelp, dulse to inland tribes?  This would have allowed landlocked tribes to get iodine and sodium in exchange for furs, arrowheads, etc.   
 
Batsheva


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From: Ron Hoggan <[log in to unmask]>
1. We can't know that salt wasn't used in Paleo times. In fact, given
patterns of population migrations suggested by genetics, Paleo people may
well have moved along sea-shores. If they were hunting and gathering their
foods there, it is very likely that they were eating considerable salt. 




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