Final answer:
Relay hostels created the trade cities along the Grand Canal, providing essential services for travelers and traders.
Step-by-step explanation:
The establishment that created trade cities along the Grand Canal were relay hostels. These were places where travelers, particularly traders, could rest and exchange goods along the canal route.
Relay hostels played a crucial role in facilitating trade and commerce along the Grand Canal in ancient China. They provided essential services such as food, shelter, and storage for goods.
The development of trade cities along the Grand Canal helped to promote the growth of economic activity and cultural exchange in China.
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