Final answer:
The lasting legacy of the Mongol Empire was the creation of trade networks that facilitated the exchange of culture, knowledge, and goods.
Step-by-step explanation:
The lasting legacy of the Mongol Empire was the creation of trade networks. The Mongols encouraged the flow of goods, services, and new ideas throughout their empire, which facilitated the exchange of culture and knowledge. This trade network had a civilizing impact, even though it also brought diseases.