US FARMING TURNING POINT. “The great turning point in the modern history of corn, which in turn marks a key turning point in the industrialization of our food, can be dated with some precision to the day in 1947 when the huge munitions plant at Muscle Shoals, Alabama, switched over from making explosives to making chemical fertilizer.””
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http://www.smithsonianmag.com/people-places/whats-eating-america-121229356/