Cooley v. Board of Wardens of Port of Philadelphia Ex Rel. Soc. for Relief of Distressed Pilots
The Court upheld a Pennsylvania law requiring ships entering or leaving Philadelphia's port to take on a local pilot or pay a fee, ruling that the state law did not violate Congress's power to regulate commerce.
The decision announced a lasting framework for dividing power between the states and Congress over commerce: some subjects need one uniform national rule, but others, like local pilotage, are better handled by different rules in different places, so states may regulate them until Congress acts.
“Whatever subjects of this power are in their nature national, or admit only of one uniform system, or plan of regulation, may justly be said to be of such a nature as to require exclusive legislation by Congress.”
The Court's key rule for deciding when states may share power to regulate commerce with Congress.
How it got here: The Pennsylvania Supreme Court ruled against the ship owner and for the pilots' fund; he sought review by the U.S. Supreme Court, arguing the state law violated the federal Constitution.
The Case in Depth
What happened
A ship owner was charged a half-pilotage fee under an 1803 Pennsylvania law because his vessel did not take on a local river pilot while entering or leaving the port of Philadelphia. The fee went to a charitable society supporting pilots and their families. The ship owner argued the law improperly taxed shipping and improperly regulated commerce, powers he said belonged only to Congress.
The question before the Court
Could Pennsylvania charge ship owners a fee for refusing to take a local river pilot, even though Congress also has power over commerce and navigation?
Why it matters
Port cities and shipping companies gained legal certainty that state pilotage fees and similar local-safety rules were valid unless and until Congress stepped in. More broadly, the ruling gave states a lasting basis for regulating local aspects of commerce and navigation, shaping how power over interstate and foreign trade was split between state and federal governments for generations.
What changes now
This was a final decision on the merits, so no further proceedings were required in this case; the Pennsylvania judgments in favor of the pilots' fund stood. The ruling's broader framework for dividing commerce-related authority between Congress and the states — allowing state regulation of inherently local subjects absent federal action — became a governing principle applied in later commerce-clause disputes.
What this does not decide
The Court expressly limited its holding to pilotage regulation and did not decide which other subjects of interstate or foreign commerce require exclusive federal control versus which may be left to varying state rules, nor how far any future congressional regulation might displace state laws on other commercial subjects.
Concurrences and dissents
Dissent — Justice McLean
“This is not a rule by which the Constitution is to be construed.”McLean's objection to basing constitutional power-sharing on which government seems more convenient.
Justice McLean argued that once Congress adopted state pilot laws by its 1789 act, those laws became federal law, showing Congress believed the commerce power over pilotage was exclusively its own. He warned that letting states regulate commerce until Congress acts would let states like Louisiana impose burdensome tolls on shipping and even override existing federal regulations by simply changing their laws, threatening a return to pre-constitutional conflicts between states.
Concurrence — Justice Daniel
Justice Daniel agreed the Pennsylvania law should be upheld but rejected the majority's reasoning that this was an exercise of the commerce power at all. He argued pilot laws are a wholly local, inherent power of the states tied to safety and self-preservation, not a form of commercial regulation delegated to Congress, so the question of concurrent commerce power never needed to arise.
How the Court got there
The legal reasoning, step by step
- The Court first asked whether Pennsylvania's pilotage fee was actually a disguised tax on imports, exports, or shipping tonnage, which the Constitution bars states from imposing without Congress's consent. It concluded pilotage fees and penalties are a distinct, long-recognized category of local port charge, not a tax on goods or tonnage.
- Because the charge was not a tax at all, the Court reasoned it could not violate the Constitution's requirement that any federal duties, imposts, or excises be applied uniformly nationwide, since that uniformity rule only governs taxes.
- The Court then addressed whether the law improperly favored the port of Philadelphia over other ports or forced vessels bound to one state to pay fees tied to another, and found no such preference or burden — if anything, pilotage costs were a competitive disadvantage ports tried to minimize, not something states used to favor themselves.
- Turning to the core question, the Court held that regulating pilots is part of regulating navigation, and therefore falls within Congress's power to regulate commerce. This raised the deeper issue of whether that federal commerce power is exclusive, shutting out any state role, or whether states can act until Congress legislates.
- The Court adopted what later became known as the doctrine of selective exclusiveness: subjects requiring one single national rule call for exclusive congressional control, but subjects like pilotage, which by their nature need different rules suited to different local ports, may be regulated by the states unless and until Congress displaces that state regulation.
- Applying this framework, the Court found that an existing 1789 act of Congress had left pilotage regulation to the states rather than occupying the field itself, so Pennsylvania's 1803 law was a valid exercise of state authority that did not conflict with any federal law.
Doctrinal impact
Cases affected by this decision
Reaffirms Sturges v. Crowninshield (4 Wheat. 193)
Cited as support that a granted federal power does not automatically bar similar state power.
Reaffirms Wilson v. Blackbird Creek Co. (2 Peters 251)
Cited as precedent allowing states to legislate on commerce-related subjects absent conflicting federal law.