Changes

The '''Steel industry''' is the worldwide heavy industry that produces [[steel]]. Most of the steel is used in construction of factories and offices, and in automobiles and machinery. The industry is highly volatile

The '''Steel industry''' is the worldwide heavy industry that produces [[steel]]. Most of the steel is used in construction of factories and offices, and in automobiles and machinery. The industry is highly volatile

In 1869 iron was already a major industry, accounting for 6.6% of manufacturing employment and 7.8% of manufacturing output.  

In 1869 iron was already a major industry, accounting for 6.6% of manufacturing employment and 7.8% of manufacturing output.  

===Carnegie===

===Carnegie===

[[Andrew Carnegie]], an immigrant from Scotland, was a salesman, promoter and financier, but not an engineer; he did not directly supervise his steel mills. His company's great innovation was in the cheap and efficient mass production of steel rails for railroad lines.  It was based in [[Pittsburgh, History since 1800|Pittsburgh, Pennsylvania]], the center of the American industry until the late 20th century.

[[Andrew Carnegie]], an immigrant from Scotland, was a salesman, promoter and financier, but not an engineer; he did not directly supervise his steel mills. His company's great innovation was in the cheap and efficient mass production of steel rails for railroad lines.  It was based in [[Pittsburgh, History since 1800|Pittsburgh, Pennsylvania]], the center of the American industry until the late 20th century.