The roman republic
The Romans established a form of government — a republic — that was copied by countries for centuries In fact, the government of the United States is based partly on Rome's model.It all began when the Romans overthrew their Etruscan conquerors in 509 B.C.E. Centered north of Rome, the Etruscans had ruled over the Romans for hundreds of years.
Once free, the Romans established a republic, a government in which citizens elected representatives to rule on their behalf. A republic is quite different from a democracy, in which every citizen is expected to play an active role in governing the state.