When Carnegie's "main focus became the steel industry," his strategy revolutioned steel production. What else did his strategy do?

His strategy revolutionized steel production and fueled the growth of the American economy.

Explanation:

Andrew Carnegie became one of the rich people in the world during the 19th century.

Therefore, we can conclude that Carnegie steel industries changed the structure of the steel industries in America, which further emphasized transforming the economy in the 19th century.

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When he was only 30 years old, in 1865, he left the railroad company to focus his attention on his growing empire. Over time, his main focus became the steel industry, and his strategy revolutionized steel production and fueled the growth of the American economy.

Explanation:

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a, he promoted disarmament