Answer: Rome grew in size and strength, early on, through trade. The location of the city provided merchants with an easily navigable waterway on which to traffic their goods.
Explanation: Trade is very important even now.
A desire for personal gain over the good of the community is
what Tocqueville warned might threaten American civic life and democracy
Robber barons is a term that was uxed to describe people who were able to amass great richess with their entrepreneurial cunning. Capitals of industry describes the same people but from a different perspective. It's very likely that the people who were talking about them were from different spheres of social life. It's more likely that the capitals of industry is more accurate.