does the roman republic have a part of government like an oligarchy or the united states?

The Roman Republic had a mixed form of government, which incorporated elements of democracy, aristocracy, and oligarchy. The most powerful governing body of the Republic was the Senate, which was composed of aristocratic members called senators. While the Senate held a significant amount of power and influence, there were also democratic elements in the Roman Republic, such as the popular assemblies and tribunes of the plebs. Additionally, there were also various magistrates and officials who were elected to govern different aspects of Roman society.

Overall, the Roman Republic did not have a government system that perfectly aligned with either an oligarchy or the United States' system of government. Instead, it had a unique combination of elements from both forms of government, as well as other political structures.