The long-term success of a widespread empire is often due to the relationship

Subject: General Questions    / College life
Question
The long-term success of a widespread empire is often due to the relationship between conquered peoples and their imperial overlords. How did Chinese, Indian, and Mongol authorities treat their conquered peoples? What was the process of assimilation and how did that affect the longevity of their empires? What seems to be the most balanced approach to ruling a diverse population?

You should talk about the condition of assimilation in all three empires: Chinese, Indian, and Mongol.