Final answer:
The United States adopted the Roman Republic's feature of a republican form of government, in which citizens elect leaders to represent them. This aspect of representative democracy from Rome deeply influenced the U.S. constitutional framework and its blend of governance.
Step-by-step explanation:
The United States adopted the democratic feature of a republican form of government from the Roman Republic. Inspired by the Romans who replaced monarchy with a republic where citizens could appoint or elect their leaders, the founders of the United States established a similar system. In the Roman government, citizens participated in the governing process through voting in public assemblies, electing consuls, and having a Senate.
American democracy was also influenced by democratic ideas from ancient Greece, specifically Athens, where democratic practices, although limited, began. However, the concept of a representative democracy, with citizens electing others to act on their behalf, was a core feature taken from the Roman Republic, which the United States turned into a constitutional framework.
The Roman constitution, although unwritten, mixed elements of governance, including democratic assemblies, an aristocratic Senate, and consuls with limited terms. This blend of governance forms, especially the electoral system where leaders and representatives are chosen by citizens, had a profound impact on the structure of the United States government.