The author arguing that the American Indians were able to help the Pilgrims, because they were sophisticated is True.
True
Step-by-step explanation:
The decision of whether to celebrate thanksgiving or not is what's dividing the native Americans. Keller wrote an editorial where she told that the ability to share the Indians helps the natives to survive the mass murder.
Even the Indians had nothing to give but still, the came forth to help them. It is True that the author is arguing that the American Indians were sophisticated because they knew that to give without holding back is one way to earn respect.