Innovations in farming. The Black Plague , Magna Carta, and the crusades all helped lead to the downfall.
Technology made manufactering more efficient. Hope this helps
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The most commonly used methods are: published literature sources, surveys (email and mail), interviews (telephone, face-to-face or focus group), observations, documents and records, and experiments.
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Answer: O Social and political activism in the U.S. Conservation efforts began
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