The human body needs salt to function properly, but surely First Nations of the prairies, people of central Africa or of Central Europe, from the Mongolian steppes and from other landlocked places, couldn’t have access to salt marshes. So where did they get it from?
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Salt (and other goods were) traded since civilization began. The earliest records of writing a receipts for trade, so it’s not as if people couldn’t do anything without modern means of transportation. As for salt – even isolated hunter gatherers would get enough from necessarily varied diet; it’s only when agriculture became prominent and nutritional habits changed to one major staple that you’d need supplementation. Salt was normally used as a preservative primarily, not as a flavor additive.
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