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So I've heard at various points that the east-west divide was unintentionally hurtful towards the west that really started to show in the last decades of the western empire. One solution I've heard is that a four way could have been better for the empire overall.
So my question is what would be the best way to divide the empire in four and when would it be the best time to do this that would provide overall better longevity to the roman world as a whole.