What impact did improvements in transportation have on tang and song china

Foreign trade was promoted by the Tang Dinasty in China which benefited widely from the strong foundation left by previous generations such as the Sui Dinasty; improvements in transportations such as new roads, canals, and sailing techniques boosted cultural exchange within China and with other nations as well, thus foreign trade bloomed which helped improving the nation's general economy.

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b. martin luther king jr. wrote and spoke "i have a dream"

explanation:

i know this 100 percent is correct   b. is the best one. < 3

russia because it is the biggest state