What elements of the Roman Republican political and legal system appear present in the systems of modern democracies?

Even though Rome was a Republic, its history has helped maintain the concept of democracy over time. Rome was a city state in Italy and was ruled by a king.  Soon the Romans started making constitutions and then fights started breaking out from the families in power and then the rest of the population. The constitution was centered on the principles of a separation of powers and checks and balances. Today, we also use the process of checks and balances because we have a Legislative, Judicial, and Executive branch, and each checks over each other so one doesn’t become too powerful. This was just like the process the city-state of Rome had used to evenly distribute power. Also Romans were ruled by rules that weren’t agreeing to the Republican government. These laws were repealed and the result was the emergence of a new way to rule which depended on society, rather than the law, to maintain dominant. The Roman Empire was also able to establish a senate just like we have the Senate and House of Representatives today. The Roman republic lasted from 509 BCE–27 BCE. During this time, the Republic expanded its territory from central Italy to the entire Mediterranean world. The republic government of Rome wasn’t just better for the people; it was very sufficient.  From the small city state of Rome we find the Republic government that established the basis of the huge government of the United States of America.