It has seemed to me that our search for this mysterious factor of difference must lead to the conclusion that it was not a single factor but the united workings of at least three forces, that brought about the wide difference. (Calvin Coolidge)

It has seemed to me that our search for this mysterious factor of difference must lead to the conclusion that it was not a single factor but the united workings of at least three forces, that brought about the wide difference.

Calvin Coolidge

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conclusion difference factor lead least search single three wide workings forces

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