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besides using the sea, the shipping lanes for travel,
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which was much faster than overland travel,
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the Romans maintained roads.
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They didn't really care about roads for everybody else.
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They wanted the roads for their Army,
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just like the US Interstate system was originally created in
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case the Army needed to be moved across the country very quickly
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if the Soviets attacked.
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So this is the same way with the Romans.
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They built roads for the army,
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but of course other people used the roads too.
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This was why Christianity and other things