The use of which of the following increased dramatically in the nineteenth century?

Question

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Steel production saw a dramatic increase in the nineteenth century and became a key material in industrialization and technological development. It was used in the construction of railroads, bridges, and skyscrapers, as well as in the manufacturing of machinery and tools. Iron production also increased, but not as significantly as steel. Copper, gold, and aluminum were also important materials during this time period, but their use did not experience the same level of growth as steel.

The Use of Which of the Following Increased Dramatically in the Nineteenth