Which best describes the impact of railroad expansion on the steel industry?
it did not affect the demand for steel at all.
it decreased the demand for steel since railroad tracks were built from wood.
it increased the demand for steel since steel was used to make railcars and tracks.
it decreased the demand for steel since the railroad was generally not used to transport steel.

It increased the demand for steel since steel was used to make railcars and tracks.

explanation:

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