Rome began as a small city-state but eventually ruled the Mediterranean world. It established a republic with elected leaders to prevent any one person from gaining too much power. Citizens were actively involved in their government. The Roman government had legislative, executive, and judicial branches with separation of powers. It differed from Athens by being representative rather than direct. Roman law, including the Twelve Tables, assured citizens rights and protections. Rome's conquests enriched it but caused unrest, leading to civil wars over power. Eventually Augustus Caesar brought stability by opening government jobs to all and establishing justice through law, with principles still used today.