Which statement best describes how railroads changed industrial practices?

railroads connected inland cities to seaports
railroads made automobiles obsolete
railroads made traveling safer
railroads could go over mountains

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.

hope this : )

some american cities felt workers were being oppressed by business monopolies