where does the state get its power to regulate commerce within its borders
Commerce Clause The Commerce Clause describes an enumerated power listed in the United States Constitution (Article I, Section 8, Clause 3). The clause states that the United States Congress shall have power "To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes." Courts and commentators have tended to discuss each of these three areas of commerce as a separate power granted to Congress.[1] It is common to see the individual components of the Commerce Clause referred to under specific terms: the Foreign Commerce Clause, the Interstate Commerce Clause,[2] and the Indian Commerce Clause.
Government procurement in the United States The authority to purchase is not one of the explicitly enumerated powers given to the Federal Government by Section 8 of Article One of the United States Constitution, but courts found that power implicit in the Constitutional power to make laws that are necessary and proper for executing its specifically granted powers, such as the powers to establish post offices, post roads, banks, an army, a navy, or militias.