How has the commerce clause affected the balance of national and state power?

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constitution Original copy of the Constitution of the United States of America, housed in the National Archives in Washington, D.C.

The commerce clause serves as a primary source of federal regulatory power, significantly shaping the balance between national and state authority. Historically, the Supreme Court has interpreted this clause to grant Congress broad authority, often allowing federal intervention in local activities that substantially affect interstate commerce.1

This balance is maintained through two main interpretations:
* Positive Authority: Congress may regulate commercial activities and local incidents that impact the national economy, such as labor standards or civil rights in public accommodations.1
* Dormant Commerce Clause: This implied prohibition prevents states from enacting laws that discriminate against or excessively interfere with interstate commerce, though states retain a "residuum of power" to regulate local matters when no conflicting federal law exists.1

While the federal government’s reach expanded significantly throughout the 20th century, the Court has occasionally limited this power by requiring a clear connection to commercial activity, as seen in rulings regarding the Gun-Free School Zones Act and the Affordable Care Act.1