What resulted from trade between the East and West Roman Empires?

Both the Western Empire at large and Rome's unimportance to the East is highlighted by the ease with which they ceded Italy and the surrounding areas to the Germanic invaders. The split of the Empire was due in part to the difficulty of governing an empire as large as the Roman's with any kind of continuity. The network of public Roman roads covered over 120,000 km, and it greatly assisted the free movement of armies, people, and goods across the empire. Roads were also a very visible indicator of the power of Rome, and they indirectly helped unify what was a vast melting pot of cultures, races, and institutions.

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