Market roads, long-distance roads, the Grand Canal, and caravan and sea routes all had important functions under the Sui and Tang. How was the city of Chang'an a key component of this network of transportation?

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The Answer of Market roads, long-distance roads, the Grand Canal, and caravan and sea routes all had important functions under the Sui and Tang. How was the city of Chang'an a key component of this network of transportation?

Market Roads, Long-Distance Roads, the Grand Canal, and Caravan and Sea