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Jul 31, 2015· There are 1,444 hydroelectric plants in the United States. They generated 7 percent of the nation’s electricity last year.. It’s a feast-or-famine source. Washington, Oregon, Vermont and Idaho
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The US iron and steel industry has paralleled the industry in other countries in technological developments. In the 1800s, the US switched from charcoal to coke in ore smelting, adopted the Bessemer process, and saw the rise of very large integrated steel mills.In the 20th century, the US industry successively adopted the open hearth furnace, then the basic oxygen steelmaking process.
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