What were the major problems of keeping such a large empire running smoothly?

Maintaining a large empire posed significant challenges, including logistical issues in communication and transportation across vast distances, which hindered effective governance. Diverse cultures, languages, and political systems within the empire often led to tensions and resistance among different groups. Additionally, resource allocation was complex, as balancing the needs of various regions while managing economic disparities proved difficult. Lastly, internal dissent and the threat of external invasions required constant military attention and resources, straining the empire's stability.