Of all the founding values that animate the American experiment, the rule of law may be the most radical. It is certainly the most fragile. The idea that law governs everyone equally — from the poorest citizen to the most powerful official — cuts against the grain of most human history, in which power has been its own justification.
What the Rule of Law Actually Means
The rule of law is not simply the existence of laws. Tyrannies have laws. What distinguishes the rule of law is a cluster of related principles:
- Generality: Laws apply to everyone, not just disfavored groups
- Publicity: Laws are publicly known before they are enforced
- Prospectivity: Laws apply going forward, not retroactively
- Consistency: Like cases are treated alike
- Independence: Those who apply the law are not subject to political control
Together these principles create a system in which power is exercised through law rather than above it. Officials may only do what the law authorizes. Citizens may do anything the law does not prohibit.
From Magna Carta to the Constitution
The rule of law has ancient roots in English constitutional tradition. Magna Carta (1215) established that even the king was subject to the law and could not act against his subjects' rights except "by the lawful judgment of his peers or by the law of the land." This was revolutionary in a feudal world of absolute monarchy.
The American founders inherited and radicalized this tradition. The Constitution's supremacy clause establishes that the Constitution itself is "the supreme law of the land" — supreme even over acts of Congress or executive orders. Where English law made the king subject to Parliament, American constitutionalism made everyone — including Congress and the President — subject to a written constitution.
Marbury v. Madison and Judicial Review
The rule of law requires an enforcement mechanism. In Marbury v. Madison (1803), Chief Justice John Marshall established that the Supreme Court has the power to strike down laws that violate the Constitution. His reasoning was straightforward: if the Constitution is law, and the courts interpret the law, then courts must be able to refuse to enforce laws that contradict the Constitution.
This power of judicial review — not explicitly stated in the Constitution but logically derived from it — became the primary mechanism for enforcing constitutional limits against the political branches.
The Fourteenth Amendment's Promise
After the Civil War, the Fourteenth Amendment extended the rule of law's reach, promising "equal protection of the laws" to all persons and prohibiting states from depriving any person of liberty or property "without due process of law." These guarantees recognized that the rule of law had been systematically denied to Black Americans throughout the nation's history.
The amendment established that the rule of law is not merely a procedural nicety but a substantive commitment to equal treatment under law — regardless of race, status, or political favor.
The Ongoing Challenge
The rule of law is not self-enforcing. It depends on a culture that respects it — officials who voluntarily comply with legal limits, citizens who hold them accountable when they don't, and courts that apply law without fear or favor.
When presidents claim authority beyond what law grants them, when legislatures pass laws targeting political opponents, when courts rule for politically favored parties — the rule of law erodes. Not dramatically, usually. Inch by inch.
The founders knew this. They built institutional safeguards precisely because they didn't trust future generations to respect limits voluntarily. Maintaining those safeguards — understanding why they exist and insisting on their enforcement — is the work of every generation.