where did the steel industry first emerge in the united states
History of the steel industry (1850–1970) In 1869 iron was already a major industry, accounting for 6.6% of manufacturing employment and 7.8% of manufacturing output. By then the central figure was Andrew Carnegie,[35] who made Pittsburgh the center of the industry.[36] He sold his operations to US Steel in 1901, which became the world's largest steel corporation for decades.