Internal factor -disproportionately costly and overextended in comparison to the available resources. External factor—Nomadic nomads lived in the frontier regions of both empires; as they became more dangerous, they eventually seized portions of both empires.
What is the reason of collapsing Chinese Empire?
There were several factors that led to the Roman Empire's downfall. Each was intertwined with the others. Even the rise of Christianity is frequently attributed to the fall.
Because of Christianity, many Roman citizens adopted pacifism, which made it more difficult to fend off the barbarian invaders.
Thus, disproportionately costly and overextended in comparison to the available resources.
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