On which theory of government is the united states based on explain

The Social Contract Theory. It was basically an idea from John Locke and Jean-Jacques Rousseau that stated the people have a right to rebel against the government if it failed to live up to it's duties. And since the United States government quote unquote is by the people for the people, they have to right to overthrow it.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.