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How did Andrew Camegie contribute to the industrial development of the United States?
O He introduced pipelines instead of railroad cars to transport oil.
O He supported labor unions and raised his workers' wages.
O He adopted new techniques to mass-produce steel at lower cost.
O He financed the first transcontinental railroad, allowing rail travel coast to coast.

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Answer:

His steel empire produced the raw materials that built the physical infrastructure of the United States. He was a catalyst in America's participation in the Industrial Revolution, as he produced the steel to make machinery and transportation possible throughout the nation

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