<P> 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 , who made Pittsburgh the center of the industry . He sold his operations to US Steel in 1901 , which became the world 's largest steel corporation for decades . </P>
<P> 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 , who made Pittsburgh the center of the industry . He sold his operations to US Steel in 1901 , which became the world 's largest steel corporation for decades . </P>
where did the steel industry first emerge in the united states
where did the steel industry first emerge in the united states
Pittsburgh
Pittsburgh