Answer:
B. Mongols used their empire to control trade, while American Indians did not create empires.
Explanation:
This is a fact. The main and most important effect of the Mongol Empire on the Silk Roads was how much safer it became and that was all a result of the Mongol imperial rule in Asia at the time. Basically, the Mongols used their power to facilitate trade along the Silk Roads and the American Indians relied on a close-knit regional trading system.