Which of these was NOT part of a single complex of river valley civilizations?

Name: Which of these was NOT part of a single complex of river valley civilizations?
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Question

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North America did not participate in the same complex of river valley civilizations as Egypt, Mesopotamia, and Indus Valley. While North America did have its own indigenous civilizations, they developed independently and were not connected to the others.

Which of These Was NOT Part of a Single Complex