The development of the Bessemer process affected the growth of cities because It enabled the mass production of steel, which was used to build new factories.
<h3>What is the Bessemer Process</h3>
The Bessemer process is a steel-making process, now largely superseded, in which carbon, silicon, and other impurities are removed from molten pig iron by oxidation in a blast of air in a special tilting retort
known as a Bessemer converter.
Through the development of the Bessemer process, more cities were built.
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Both were poor peasants; other leaders were upper-class or well educated or from the military.
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The effect of john brown leading attacks on harpers ferry is federal troops begin capturing southern territories.
<h3>Who was Harpers Ferry?</h3>
John Brown attacked harpers ferry hoping to capture the arsenal and start a slave rebellion in the south.
Federal troops begin capturing southern territories was the major effect of john brown leading attacks on harpers ferry.
Therefore, D is the correct option.
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