Artifacts from American Indian settlements have helped explain the argument. Why? Because it was these artifacts that helped identify the specific objects which were being used to trade.
Artifacts support the argument that most of these materials were and could have been only acquired through respective trade in a manner that was aligned with the customs of the [American] Indians.
Shipping inventories would not reveal much in detail about the interactions between Natives and Europeans.
Diaries from British settlers would be focused on the life of the colonial community, and would not focus on interaction with Native Americans.
Spanish Government reports would not have a good and close listing of items that were traded, and how.
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