It is generally accepted by everyone that skyscrapers were discovered in Chicago, the third largest city in the U.S. For the construction of Sears Tower, 2400 workers worked for three years, the building was completed in 1973. Skeleton tower consists of new pipes that cross section of rectangular shape, forming the basis of a huge square of side 69 meters. Everything was made of concrete, sits on pillars filled with chunks of rock, they are set by the layer of earth...
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Chicago passes today as the unofficial capital of the inside part of the United States! It's called 'the city that works ", but still bears the appellation of the " Windy City "due to the strong winds are present throughout the year. Its brief history tells us that there was first mentioned in 1803 when the U.S. Army built a fort for defense. It was only in 1825 when the city transformed. At first it was ...
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