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Xi’an Map on The iron industry also grew rapidly as the Industrial Revolution progressed. Iron was used to build railroads, steamships, machinery and bridges. New ways of producing purer iron of higher-quality resulted in additional uses for iron, such as farm implements, moving parts for factory machines and steam engines. However, it was the discovery of the process by which iron could be turned into steel that revolutionized the iron industry. In the mid-18th century, Henry Bessemer in England and William Kelly in the United States learned how to make steel by injecting air into molten ore. Steel became cheaper and more durable with this process; and thereafter, steel was used in making railroads, bridges, and buildings. This process paved the way for skyscrapers that would dominate cities in the following centuries. Xi’an Map 2016.

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