By 
Kenneth Davis
 | 
TED-Ed Original

How inventions change history (for better and for worse)

Invented in 1793 the cotton gin changed history for good and bad. By allowing one field hand to do the work of 10 it powered a new industry that brought wealth and power to the American South -- but tragically it also multiplied and prolonged the use of slave labor. Kenneth C. Davis lauds innovation while warning us of unintended consequences.

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