Describe how roads helped Rome increase and consolidate its power

As the legions blazed a trail through Europe, the Romans built new highways to link captured cities with Rome and establish them as colonies. These routes ensured that the Roman military could out-pace and out-maneuver its enemies, but they also aided in the everyday maintenance of the Empire.

Nation of conflicting ethnic groups

This question has already been answered by someone else.here is a link.  hope that it .