Why did historians and others have difficulty classifying many of the Plains Indian tribes? a.
There were few commonalities among the tribes.
b.
There was great variation in the languages that they spoke.
c.
They had similar economic and social structures but widely different political structures.
d.
They were so heavily influenced by European cultures that they had lost much of their unique cultural characteristics through assimilation.

c it is sure c

Explanation:

c it is correct answer

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