The expansion of the rail networks led to
a growth in the steel industry.
a growth in the oil industry.
a decline in the coal industry.
a decline in the meatpacking industry.

The expansion of the rail networks led to a growth in the steel industry. Option A is correct.

Since the construction of the railroad network required a large amount of steel, specially for the rails, in addition to the fact that steel was also a vital component of the locomotives, the expansion of the rail networks needed further steel, so that it marked the growth in the steel industry.

The railroad expansion of the middle and late 1800s changed America forever.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.