Rome unite its power by expanding its military and language. They developed important ideas about laws and government. They had fine engineering, and built roads, cities, and outstanding buildings.
The Roman empire was united by good roads and bridges and secure sea lanes. It had a excellent military service. Good communications due to the roads and courier system, gave the provincials a sense of belonging, instead of being treated like outsiders. The Romans also established colonies of veterans or volunteers who were Roman citizens.
