The statement that best summarizes the main idea of "Coming of Age in the Dawnland" is:
According to the literary piece "Coming of Age in the Dawnland" the author details the differences between the Native Americans and the Europeans and tries to squash the stereotypes surrounding the natives.
Charles C. Mann is the author of the piece as he makes some specific arguments as to why the two different groups acted the way they did because of the times and the effects of their societies.
Therefore, the correct answer is option D.
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