<span>The level of sophistication under the first Qin emperors was large. During his rule, Qin standardized coins, weights, and measures; interlinked the states with canals and roads; and is credited for building the first version of the Great Wall.</span>
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Explanation:
section4. In 1865 President Andrew Johnson implemented a plan of Reconstruction that gave the white South a free hand in regulating the transition from slavery to freedom and offered no role to blacks in the politics of the South
I know its a late answer but the discovery of machines. It helped create things faster.
