Why do critics claim that our national government (of the united states) is an oligarchy rather than a representative democracy?

Which of the principles do you feel is more important for our our american society? respond in 3 sentences. (principals: popular sovereignty, republicanism, federalism, separation of powers, checks and balances, limited government, or individual rights)

She works very in school. in the same way, she worked diligently at home.

What kind of government is based on the idea of popular sovereignty?