The cause of the Roman Empire expansion was successful military campaigns. The effect was that as the Roman empire grew, so did the number of enemies.
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Romes soilders became less loyal and disiplined
The biggest concerns of the Romans were protecting the vast frontiers of their empire from invasions and maintaining internal stability.
In the Later Roman Empire enemies who besieged Roman cities damaged the aqueducts which took water the the cities to disrupt or cut off the water supply.
The ability to engineer great buildings and infrastructure was a Roman ideal. It was not a reason why the Roman Empire declined.
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