Industry, Economy USA has the leading industrial power in the world. It is highly diversified and technologically advanced. The main industries are petroleum, steel, motor vehicles, aerospace, telecommunications, chemicals, electronics, food processing, consumer goods, lumber, and mining. Before the 1980s the main industry in America was manufacturing, but then more high technology industries became main industries. High technology industries are petroleum refining, aerospace, steelmaking and automobile industry. Advances in chemistry and electronics have revolutionized many industries through new products and methods. Science has vastly expanded the number of metals available for industrial purposes, notably such light metals as aluminum, magnesium, and titanium. In the 1980s and 1990s, the United States was the world leader in computer manufacturing. At the beginning of the 21st century, however, the high-tech
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they better withstood the impact, vibration, and concentrated loads of heavy rail traffic. The earliest known use of steel in bridge construction was the 334ft (102m) suspension span across the Danube Canal (1828) near Vienna (Austria), designed by Ignaz von Mitis. The steel eye-bar chains were forged from decarburized iron from Styria. Steel halved the weight of wrought iron, but remained prohibitively expensive for another forty years before steelmaking processes such as the Bessemer and the open-hearth were perfected (it is uncertain whether the Styrian ironmasters created real steel or whether the decarburization was a mechanical process resulting in a surface- hardened steel, a kind of wrought iron rather than the mass steel that results from the Bessemer process). The first major bridge utilizing true steel was the Eads Bridge (1874), the most graceful of
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