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what impact did Andrew carnegie and John D Rockefeller have on the american economy in the last 1800s

Respuesta :

Both Andrew Carnegie and John D Rockefeller had a huge impact on the American economy in the late 1800s, since this invested huge sums of capital into massive building projects that employed thousands of workers, and provided vital infrastructure. 
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Answer:

They established and dominated the new steel and oil industries.

Explanation:

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