The Us has threee branches of government: the legislative, the judicary, and the executive.Ê These branches are responsible to one another by creating a "check and balance system"Ê This system prevents one branch from overpowering another.
The three branches of government (Judicial, Legislative and Executive) each have a different job. They are separated into branches so they can check eachother, making sure none of the three have too much power; thus creating checks and balances.
The purpose is to prevent one of the branches of the government from dominating the others. There are 3 branches of government: executive power (president), legislative power (congress) and judicial power (Supreme Court).