the tang dynasty made many great agricultural something. New agriculture tech. heavy iron plow, harnessed oxen. the tang dynasty was a period of expansion, especially in trading with foreign lands. they used the silk road as a trade route. used coins as currency. rice was improved by cultivation. they imported rice from Vietnam. the song dynasty was twice the size of the tang dynasty. their major exports are silk, porcelain, and tea. song traded gunpowder. the trade led to the invention of paper money.
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