How did railroads expand the western industries?

As more railroads were built, it helped to expand the nation and the West Industries cropped up in the West and used the railroads to link industry to markets in the Eastern part of the nation.

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

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a. always outside of government control.