During the mid-nineteenth century,the U.S.steel industry concentrated around ________ in an area proximate to iron-ore and coal mines.

Question

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Pittsburgh was the center of the U.S. steel industry during the mid-nineteenth century due to its proximity to both iron-ore and coal mines. The city was also well-situated for transportation and shipping, which facilitated the growth of the industry.

During the Mid-Nineteenth Century,the U