The argument in one screen
State courts keep pre-existing jurisdiction
Hamilton starts from a presumption of retention, not silent displacement, unless the Constitution or later federal law clearly excludes state power.
Concurrent jurisdiction is often natural
He thinks many cases under union law can initially be heard in state courts as well as federal ones.
Appeals preserve national coherence
National appellate review is what stops concurrent jurisdiction from turning one Union into many disconnected legal interpretations.
State and national courts are part of one system
Hamilton treats the local and federal judiciaries as kindred systems, not as wholly hostile universes.
Why Hamilton thinks national and state courts can coexist without chaos
Federalist 81 defended the structure of the federal judiciary. Federalist 82 asks the next question: when federal jurisdiction exists, is it always exclusive, or can state courts still hear some of the same classes of causes?
Hamilton's answer begins with a rule of retention. The states keep the judicial authority they already possess unless that authority is clearly taken away. Mere implication is not enough when the result would be an alienation of state power.
Not a doctrine of sealed compartments. A doctrine of overlapping authority held together by final national supervision where the Union's law and peace are at stake.
“the state courts will retain the jurisdiction they now have, unless it appears to be taken away in one of the enumerated modes.”
Hamilton's presumption is retention, not silent displacement.
“the state courts would have a concurrent jurisdiction in all cases arising under the laws of the union, where it was not expressly prohibited.”
He thinks many union-law cases can begin in state tribunals without destroying the federal system.
“The courts of the latter will of course be natural auxiliaries to the execution of the laws of the union”
Hamilton treats state courts as potential working partners in national law, not as permanent outsiders to it.
How Hamilton explains concurrent jurisdiction and appeals
He distinguishes between cases state courts already know how to hear and cases wholly peculiar to the new Constitution. In the former category, concurrent jurisdiction seems especially natural, because existing state judicial authority is being retained rather than silently erased. In the latter, Congress may sometimes decide that federal courts should hold the field more exclusively.
But if state courts do hear union-law cases, Hamilton thinks appeals to national tribunals are essential. Otherwise plaintiffs and prosecutors could sometimes bypass the intended federal judicial authority merely by choosing a favorable local forum. Concurrent jurisdiction without national appellate control would risk defeating the very purposes of federal judicial power.
That is why he treats state and national judiciaries as parts of one whole. State courts can act as natural auxiliaries, but the Union still needs final tribunals capable of uniting and assimilating the principles of national justice.
He wants state authority preserved where preservation is reasonable
Hamilton does not assume the new Constitution wipes clean the older judicial map of the states.
He wants federal law to remain genuinely federal
Appeals to national courts are necessary so local variation does not become practical nullification of union law.
He wants flexibility in institutional design
Hamilton even leaves room for Congress to route appeals to subordinate federal tribunals where that would reduce duplication and burden on the Supreme Court.
Federalist 82 matters because it shows Hamilton trying to make federalism administratively workable. He is not only defending abstract supremacy. He is explaining how a compound republic can let state institutions keep doing real work without allowing national law to dissolve into local contradiction.
It also matters because the essay highlights one of Hamilton's recurring instincts: when two institutions overlap, the answer is not always to eliminate one of them. Sometimes the answer is to define their relation clearly and preserve a final harmonizing authority above both.
Why Federalist 82 matters in the larger judiciary sequence
Federalist 80 defended the range of cases national courts must be able to hear, and Federalist 81 defended the structure of the judiciary itself. Federalist 82 explains how those national tribunals can coexist with continuing state-court authority through concurrency plus appeal.
The next essay, Federalist 83, turns from jurisdiction to the civil-jury objection and argues that constitutional silence is not abolition, while the already-live Federalist 84 carries Hamilton into the wider bill-of-rights dispute. For the wider frame, return to Who wrote the Federalist Papers? or carry the constitutional-supremacy thread into judicial review.
What to read next
Primary sources and further reading
- The Federalist No. 82 | Founders Online — Hamilton on concurrent jurisdiction, retained state-court authority, and why appeals to national tribunals keep union law coherent.
Related essays by theme
Use Federalist 82 to see how Hamilton thinks federalism works in court rather than only on paper
This is the essay to read when you want Hamilton's answer to a practical federal question: how do state courts keep doing real work while the Union still preserves one coherent body of national justice?
Hamilton's reading of state-federal court concurrency still frames how the two systems actually coexist.