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In the second half of the dynasty, striking social and economic changes also took place. Iron implements were introduced from W and central Asia, the ox-drawn plow was first used, and large irrigation and water-control projects were instituted, resulting in increased crop yields in N China. Trade developed as cities grew in number and size and roads and canals were constructed. Chou society was sharply divided between the aristocratic warrior class and the peasant masses and domestic slaves.
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