The correct answer is option "A": The main change brought by the steel industry to American architecture of the late 1800s was the use of steel to build skyscrapers that needed limited city space. The early skyscrapers were built in New York City and Chicago between 1884 and 1939 as commercial buildings. Besides, the increasing use of urban land due to the cities economic growth, led to the development of taller buildings which became labelled as skyscrapers. The emergence of skyscrapers was possible thanks to technological improvements as well as structural advances for the design of steel and iron framed buildings.
