How is the constitution of the United States organized? What does preamble and each Article explain?

The United States Constitution is the supreme law of the United States and is originally composed of 7 articles.

The first 3 articles explain the government division into 3 branches:

Article 1: Describes the role of Congress (House of Representatives and Senate) Article 2: Describes the role of the Executive (The President) Article 3: Describes the Judicial Branch (Court system)

The next 3 articles explain the concepts of federalism:

Article 4: Describes the relationship among existing states and between these states and the federal government. Article 5: Describes the process for placing amendments on the Constitution. Article 6: Establishes the Constitution, all Federal laws and treaties as the supreme law of the United States.

Finally, article 7 establishes and describes the procedure that would be used by the states to ratify the Constitution.