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Early skyscrapers
The early skyscrapers were a range of tall, commercial buildings built between 1884 and 1939, predominantly in the American cities of New York and Chicago. Cities in the United States were traditionally made up of low-rise buildings, but significant economic growth after the Civil War and increasingly intensive use of urban land encouraged the development of taller buildings beginning in the 1870s. Technological improvements enabled the construction of fireproofed iron-framed structures with deep foundations, equipped with new inventions such as the elevator and electric lighting. These made it both technically and commercially viable to build a new class of taller buildings, the first of which, Chicago's tall Home Insurance Building, opened in 1884. Their numbers grew rapidly and by 1888 they were being labelled ''skyscrapers''.
Chicago initially led the way in skyscraper design, with many constructed in the center of the financial district during the late 1880s and early 1890s. Sometimes termed the products of the Chicago school of architecture, these skyscrapers attempted to balance aesthetic concerns with practical commercial design, producing large, square ''palazzo''-styled buildings hosting shops and restaurants on the ground level and containing rentable offices on the upper floors. In contrast, New York's skyscrapers were frequently narrower towers which, more eclectic in style, were often criticized for their lack of elegance. In 1892, Chicago banned the construction of new skyscrapers taller than , leaving the development of taller buildings to New York.
The first decade of the 20th century saw a new wave of skyscraper construction. The demand for new office space to hold America's expanding workforce of white-collar staff continued to grow. Engineering developments made it easier to build and live in yet taller buildings. Chicago built new skyscrapers in its existing style, while New York experimented further with tower design. Iconic buildings such as the Flatiron were followed by the tall Singer Tower, the Metropolitan Life Insurance Company Tower and the Woolworth Building. Though these skyscrapers were commercial successes, criticism mounted as they broke up the ordered city skyline and plunged neighboring streets and buildings into perpetual shadow. Combined with an economic downturn, this led to the introduction of zoning restraints in New York in 1916.
In the interwar years, skyscrapers spread to nearly all major US cities, while a handful were built in other Western countries. The economic boom of the 1920s and extensive real estate speculation encouraged a wave of new skyscraper projects in New York and Chicago. New York City's 1916 Zoning Resolution helped shape the Art Deco or "set-back" style of skyscrapers, leading to structures that focused on volume and striking silhouettes, often richly decorated. Skyscraper heights continued to grow, with the Chrysler and the Empire State Building each claiming new records, reaching and respectively. With the onset of the Great Depression, the real estate market collapsed and new builds stuttered to a halt. Popular and academic culture embraced the skyscraper through films, photography, literature and ballet, seeing the buildings as either positive symbols of modernity and science, or alternatively examples of the ills of modern life and society. Skyscraper projects after World War II typically rejected the designs of the early skyscrapers, instead embracing the international style; many older skyscrapers were redesigned to suit contemporary tastes or even demolished—such as the Singer Tower, once the world's tallest skyscraper.
==Background: 1850–79==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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