<span>The Tang Dynasty retained and refined the civil service system that the Sui Dynasty had restored.</span><span>
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Answer: hi there
Explanation: I’m also trying to figure out this.thx for not making me spend some points on the same question
Answer: With the invention of the cotton gin, it meant that more cotton could be processed by less workers ( most of the workers were slaves) in less time so the need for more slaves in that area became unnecessary. The cotton gin could process 50 pounds of cotton a day with a small crew of 2 or 3.
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