The fact that us citizens elect representatives to make laws and implement public policies on their behalf is evidence that the united states government is what?

In the United States, this is a sign that there is democracy in the country because it entitles the people to participate in the decisions made by the government through public opinion and the decisions to make the laws and public policies that determine the good state and order in citizenship.

The United States is a Constitutional Republic since its citizens elect representatives to make laws and implement public policies on their behalf.

A constitutional republic can limit the power the government has over citizens, thus, protecting the citizens. Apart from the United States, Iceland is another country that is a constitutional republic.