Answer:
The factors responsible for the growth of the Iron and Steel industry in Pittsburgh: (a) Located on the Allegheny plateau, where the confluence of the Allegheny from the north-east and Monongahela from the south-east form the Ohio river. (b) The growth of Pittsburgh and its economy was caused by the extensive trade in steel through the 1970's. (c) Coal is available from the Appalachian, iron-ore comes from Minnesota. (d) The Ohio, Monongahela and Allegheny rivers provide adequate water supply. (e) Labour comes from the densely populated eastern part of the USA. (f) The shipping routes of the Great Lakes are a cheap means of transport. Finished goods are transported to the market by both land and sea routes. (g) The steel is used by other industries such as railroad equipment, rails and heavy machinery.
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