Article 1 of the US Constitution details the legislative branch of the US Government – also known as Congress. Article 1 establishes that Congress makes laws for the US and consists of the House of Representatives and the Senate.
Article 7 states that when 9 states approve of the Constitution in their conventions, then the Constitution shall be set up as the government for the states that have approved it.
Article 6 describes the powers and supremacy of the US Constitution when establishing laws and treaties.
Article 5 describes how the US Constitution can be changed or updated. We see this in the form of ammendments.
Article 4 describes the establishment of states and their relationship to each other. It also describes the interaction with the central federal government.
Article 3 focuses on the judicial branch and the powers of the court. They are there to establish law and order.