What form of democracy is used in the united states?

Representative Constitutional republic. The U.S. is not a democracy because the constitution and laws restrain the government, not the vote of the citizens.
The United States of America if more of a Republican democracy. If we were a total democracy there would be more.... I think Freedom is the Word I'm looking for. There would be more power to the people and less control coming from The House of Representatives, Senate, and President.