The Romans invented cement, which was stronger than stone and designed huge arches and domes with it. They also used concrete to build more than 50,000 miles of roads. This helped unify the empire. Aqueducts carried water from the countryside to the city.
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The Romans invented cement, which was stronger than stone and designed huge arches and domes with it. They also used concrete to build more than 50,000 miles of roads. This helped unify the empire. Aqueducts carried water from the countryside to the city.