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Andrew Carnegie's company initially used iron to build bridges due to its strength, availability, and cost-effectiveness compared to other materials at the time. Iron was a widely used material in the 19th century, allowing for the construction of durable and reliable structures. The use of iron in bridge building also facilitated the expansion of transportation networks, which was crucial for industrial growth. As technology advanced, Carnegie later embraced steel, which offered even greater strength and flexibility.

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1mo ago

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