Tang had strong military made up of militias.
Tang made great agricultural advancements. Had wells for irrigation. Made heavy iron plow. harnessed oxen and water buffalo.
Tang dynasty was a period of expansion in trading and with foreign land. Caravan routes traveled as far as Syria. Used silk road. Used Grand Canal. coins for currency.
Song had many agricultural advancements. rice was improved by cultivation.
China's cities were growing fast, Song was twice the size of Tang. Without Rice, China could not be fed.
Traders used China's rivers to ship goods on barges and ships. Trade grew so rapidly that there was a copper coin shortage so they had to make paper money.
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