Why: There were a number of factors that contributed to the split of the Roman Empire, including:
* Political factors: The Roman Empire was becoming increasingly difficult to govern from a single centralized location, as it expanded and became more complex. This led to the development of regional power bases, and the emergence of rivalries between different imperial factions.
* Military factors: The Roman army was also becoming increasingly decentralized, with different units often loyal to their local commanders rather than to the emperor. This made it difficult for the empire to respond effectively to external threats, such as invasions by barbarian tribes.
* Economic factors: The Roman Empire was also facing economic challenges, including inflation and a decline in trade. This put a strain on the empire's resources, and made it difficult to maintain the military and administrative structures that held the empire together.
* Cultural factors: The Roman Empire was also becoming increasingly diverse, with different regions developing their own distinct cultures and languages. This made it difficult to maintain a sense of unity and cohesion across the empire.