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What role did the Yam play in the expansion of the Mongol Empire?
It was a postal service that doubled as a spy network.
It was a written system of laws that kept peace and order.
It was a source of loans for merchants to promote business.
It was a period of peace when people felt free to trade and travel.
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What role did the Yam play in the expansion of the Mongol Empire?
It was a postal service that dou...
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