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 mines. There are several known stockpiles of naturally occuring sodium chloride in various parts of the world. The Verde mine in Arizona was used by the local tribes as a trading commodity for several hundred years.
Source: I live right down the road from the Verde mine and there is a great Native American archeology center right in town.
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