It was believed Mound Builders were influenced by what Native American Tribes
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The inference is that Mound Builders were influenced by Native American Tribes known as C. South American and Asiatic people.
An inference is the conclusion that can be deduced based on the information given in a story.
In this case, the inference is that Mound Builders were influenced by Native American Tribes known as South American and Asiatic people.
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