In addition to acting as a broad source of federal power,the Commerce Clause also restricts the power of the states to regulate activities if the result obstructs or unduly burdens interstate commerce.

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This is a well-established principle in constitutional law known as the dormant Commerce Clause. It prohibits states from enacting laws that discriminate against out-of-state businesses or impose an undue burden on interstate commerce. The Commerce Clause therefore operates as a two-sided coin, granting Congress the power to regulate commerce and limiting the power of the states to interfere with it.

In Addition to Acting as a Broad Source of Federal