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The Roman Empire was structurally hard to sustain because it was too large, lacked natural boundaries comparable to China, faced northern invaders and Persia, and kept republican institutions unsuited to imperial management.
"Why did it collapse? What were the factors that led to its eventual demise? So those are the three questions we will be looking..."
"At this time they were fighting against the Parthians. But later on they would fight against what is what we call the Sassanid Persian...."
Byzantium survives for a thousand years because it solves Rome's political problem.
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