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What economic opportunity was the primary cause of Andrew Carnegie's opportunity for fortune? A. the market for iron and steel for infrastructure construction such as train tracks and bridges B. improvements in the ways in which wooden bridges and buildings were constructed C. the discovery of oil and the invention of the gas-fired engine D. World War I and the need for ships and ammunition

User Cassmtnr
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A! He found his wealth through the steel industry.
User Abhiz
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