Article 1 of the U.S. Constitution establishes the legislative branch of the U.S. government, the U.S. Congress. The longest of the articles to the Constitution, Article I is broken down into 10 sections, and describes the organization of Congress and its delegated powers.
Section I of Article I is a vesting clause granting all the federal government's legislative authority to a bicameral legislature consisting of the Senate (based on equal representation for each state) and the House of Representatives (with representation based on population). Section II establishes rules for the House of Representatives, specifically the method of election, length of terms and age requirements. Likewise, Section III establishes rules for the Senate. Section IV details the procedures for holding elections and meetings. Section V deals with membership rules, including those dealing with the punishment and expulsion of members. Section VI establishes pay and protection for members. Section VII explains the journey of a bill as it is signed into law. Section VIII enumerates the powers of Congress and Section IX stipulates the limits to those powers. Section X limits the powers of the states. For instance, a state cannot make a treaty with a foreign power or coin its own money.