Answer: According to articles, the main ideas of the U.S constitution are
Article I: Legislative branch founding
Article II: Executive founding
Article III: Judicial, or supreme court founding
Article IV: Establishing the necessities and relationships of the States.
Article V: How to amend the constitution
Article VI: Establishing Supreme Law
Article VII: Rules for ratification
Also what you could be looking for are the principles that the constitution establishes. They are the rules of:
Popular sovereignty, Republicanism, federalism, separation of powers, checks and balances, limited government, and individual rights.
