What did the Romans do to help protect most cities from attack?
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They built them on hills.
They surrounded them with canals.
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They bordered them with farmland.
They constructed walls around them.

They built them on hills.

Explanation: Two mountain ranges, the Alps and the Apennines, helped to protect Rome from invasion. The Apennines divide the Italian peninsula in half it allowed the Romans to mass forces for counter-attack whenever they were threatened.

it further strained relations between the north and the south and convinced