What political idea did the US not adopt from the Romans checks and balances representative democracy three branches of government or direct democracy?

The United States did not adopt direct democracy from the Romans. Instead, the U.S. established a representative democracy, where elected officials make decisions on behalf of the citizens, contrasting with direct democracy where citizens vote on laws and policies themselves. Although the Romans had elements of checks and balances and a form of representative governance, their system was not as structured or formalized as that of the U.S. with its three distinct branches of government.