Article 6 of the United States Constitution establishes the foundational principle of constitutional supremacy, defining the relationship between federal and state law and ensuring a unified legal framework for the nation. This clause, often called the Supremacy Clause, serves as the anchor for the entire constitutional system, resolving conflicts between different levels of government.
Text and Literal Meaning
The text of Article 6, Clause 2, states: "This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding." This language is unequivocal, positioning the Constitution, federal statutes, and valid treaties as the highest form of law in the country.
Relationship Between Federal and State Law
At its core, Article 6 resolves the ambiguity inherent in the original relationship between state and federal authority. Before the Constitution, the Articles of Confederation created a weak central government where state laws often superseded federal directives. The Supremacy Clause flips this hierarchy, ensuring that when a conflict arises between a valid federal law and a conflicting state law, the federal law prevails. This prevents a patchwork of contradictory regulations across the 50 states.
Doctrine of Preemption
Judicial interpretation, primarily through Supreme Court cases, has expanded the Clause into the doctrine of preemption. This doctrine operates on three levels: express preemption, where federal law explicitly states it overrides state law; field preemption, where federal regulation is so comprehensive that it occupies the entire field, leaving no room for state regulation; and conflict preemption, where compliance with both federal and state law is impossible or where state law stands as an obstacle to achieving federal objectives. This mechanism ensures national consistency in critical areas like aviation, pharmaceuticals, and environmental regulation.
Judicial Enforcement and the Oath of Office
The enforcement mechanism of Article 6 is unique because it relies on the judiciary itself. Federal judges are bound by their oath of office to uphold the Constitution, meaning they must apply federal law over state law when the two collide. Furthermore, state judges are equally bound by this clause; they cannot use state constitution or state statutes as a defense for ignoring federal supremacy. This creates a uniform application of law regardless of the state in which a case is heard.
Treaties as Supreme Law
Importantly, the Clause extends its reach beyond domestic legislation to international agreements. When the United States ratifies a treaty, it becomes part of the "supreme Law of the Land" equal to any statute passed by Congress. This integration of international law into the domestic legal system binds both the federal government and the states, provided the treaty is self-executing or implemented by Congress. This clause was a critical component in convincing the founding generation to support ratification, linking national honor to legal obligation.
Historical Context and Legacy
The inclusion of Article 6 was a direct response to the weaknesses exposed under the Articles of Confederation, where states frequently ignored federal requests, leading to economic chaos and diplomatic weakness. Alexander Hamilton famously defended the Clause in Federalist No. 33, arguing that it was necessary for the "energy" of the government and the "security of the people." Its legacy is visible in landmark decisions that shaped civil rights and federal power, ensuring that the Constitution remains a living, enforceable document rather than a mere suggestion among sovereign states.
