The Roman republic had a greater influence on the democracy of the Unites States.
The reason this is the answer is because:
The Roman people elected officials who governed them. These officials are responsible to the people who put them in government. This is the case with America.
The Romans protected the citizens by a legal code. This also impacted America and its protection of citizens.
Many of the principles of the Roman Republic are similar to the American system of government. Their leaders were elected to positions by citizens and were accountable to those citizens. ... Because of this, more power in the government was given to the wealthy and weakened the power of the poorer Roman citizens.
In the Roman republic they hold a vote know as the overpowering vote which was a way to; as it says in title the "overpowering" vote was created to overpower/overthrow the leader of the country. it is also reported that they would speak to the kings "right hand man" and try to convince them that they are right about going to war and to enlighten the other republics claims in the field.