<P> Sheffield, South Yorkshire, England, United Kingdom; Pittsburgh, Pennsylvania, United States; Pueblo, Colorado, United States; and Newcastle, New South Wales, Australia, Hamilton, Ontario, Canada are the cities most commonly referred to with this name, in their respective countries . </P> <P> Steel City is also the name of the primary setting in Jules Verne's novel The Begum's Fortune and is the location of the Titans East headquarters in the Teen Titans animated series . </P>

Which of the following cities was the major southern center for steel production