Ford Motor Company assembly line, Detroit, c.1920. In short, technological change improved Americans' economic welfare.
Central Park to the twin towers of the San Remo apartment house on Central Park West as it is illuminated by electric lighting at night, New York, mid-20th Century.
The warmth of other suns : the epic story of America's great migration
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Brilliant : the evolution of artificial light
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1920-1940 : the twentieth century
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