Silk was not only important for just any handy resource to craft or make something useful or important for life but it was mainly in demand due to the fact that it was a significant factor in the development of several cultures. I don't know if this takes your question head on but I hope it helps :)
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A. It was a period of rapid economic and social transformations.
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D. The United States expanded the Monroe Doctrine Forcefully
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It connected the eastern and western coast which caused the economy to pick up and move faster.
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<span>An amendment can be proposed by a 2/3 vote in the House of Representatives.</span>