“The Indians could not undertake any widespread cultivation of the plains not only because they lacked iron tools but also because they had no draft animals.”
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Surprising as it may seem, this study indicates that similar conditions are best for all sorts of races.
Ellsworth Huntington 
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The Indians could not undertake any widespread cultivation of the plains not only because they lacked iron tools but also because they had no draft animals.
Ellsworth Huntington
61% of people like this quote
Fertile soil, level plains, easy passage across the mountains, coal, iron, and other metals imbedded in the rocks, and a stimulating climate, all shower their blessings upon man.
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For the source of any characteristic so widespread and uniform as this adaptation to environment we must go back to the very beginning of the human race.
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The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity.
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