Answer:
The answer is concrete
Explanation:
Ancient Roman concrete was a mixture of lime mortar, aggregate, pozzolana, water, and stones, and was stronger than previously-used concretes. The ancient builders placed these ingredients in wooden frames where they hardened and bonded to a facing of stones or (more frequently) bricks.
The lengthening of the barrel and the transition from muskets to rifles.<span> The longer barrel helped with accuracy. With rifles, the US could fire at the British from a safe distance and with accuracy.</span>
It became known as the reconstruction era of the south
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