Answer :
The existence of single rule that controls the Roman Empire was the evidence that shows that the Empire was unified
How is the Unification possible?
The Unification was possible as Emperor Diocletian divided the nation into western and eastern halves which allows effective managing of the empire easier.
However, there were competition between the leaders of the halves and this resulted in civil war that led the general Constantine unifying the empire under his own rule.
In conclusion, the existence of single rule that controls the Roman Empire was the evidence that shows that the Empire was unified
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