One of the key influences of the Roman Republic on the framing of the U.S. Constitution was the concept of a mixed government and balance of powers. The Roman Republic featured a system with distinct branches of government, including the Senate (representing the aristocracy), the Assemblies (representing the citizens), and elected officials like consuls (executive leaders).
This concept influenced the framers of the U.S. Constitution, who sought to create a system that balanced power among various branches of government (legislative, executive, and judicial) to prevent any one branch from becoming too powerful. The framers were inspired by the idea of checks and balances, which was critical to the functioning of a republic.
Other influences included the idea of civic virtue and the importance of a representative government, as well as territorial expansion and the role of the citizen in government.