The argument in one screen
Defense belongs to common councils
Threats from Britain, Spain, and neighboring powers surround the Union as a whole, so defense must be directed by common councils and paid from a common treasury.
State military establishments distort the Union
If exposed states bear the burden alone, the arrangement becomes inequitable; if several states build up forces, mutual suspicion and counterweights follow.
Rigid peacetime bans are self-defeating
Hamilton says the nation cannot wait for actual invasion before preparing to defend itself. A constitutional rule that demands that would be political theater, not prudence.
Militia alone is not enough
He insists that war against a disciplined enemy requires trained regular forces. Military capacity cannot be improvised from theory once crisis arrives.
Why Hamilton pushes the defense argument further
Federalist 24 argued that the standing-army objection ignores both constitutional checks and real security conditions. Federalist 25 widens the point. Hamilton now says national defense itself cannot be broken apart and reassigned to the states without injuring both liberty and Union.
The essay matters because Hamilton is not merely defending military discretion in the abstract. He is describing what happens if Americans try to keep the Union weak while still expecting it to secure frontiers, coastlines, commerce, and peace. The burden falls unevenly, jealousy grows, and the national government becomes dependent on rival state establishments.
This is also where Hamilton turns the liberty objection back on its users. If armies are dangerous, he argues, they are less dangerous in the hands of the national government — where public jealousy is more alert — than in the hands of local authorities whom citizens trust too easily.
“an inversion of the primary principle of our political association; as it would in practice transfer the care of the common defence from the fœderal head to the individual members: A project oppressive to some States, dangerous to all, and baneful to the confederacy.”
Hamilton says shifting defense to the states would reverse the very logic of Union and make common safety depend on local burdens and local incentives.
“The territories of Britain, Spain and of the Indian nations in our neighbourhood, do not border on particular States; but incircle the Union from MAINE to GEORGIA.”
The point is geographic and political at once: if the danger is common, the councils and treasury that answer it must also be common.
“As far as an army may be considered as a dangerous weapon of power, it had better be in those hands, of which the people are most likely to be jealous, than in those of which they are least likely to be jealous.”
Hamilton argues that liberty is not protected by scattering military force among less-suspected local authorities. Suspicion itself is part of the safeguard.
How Hamilton builds the reply
He turns common danger into common responsibility
The Union is encircled by rival powers and exposed frontiers, so defense cannot be a local afterthought delegated to whichever states happen to stand nearest the danger.
He treats separate state armies as a structural threat
Multiple military establishments would not simply duplicate effort. They would feed interstate jealousy and give ambitious states instruments that could abridge federal authority.
He insists preparation must come before attack
Hamilton rejects constitutional formulas that would disable military readiness until after invasion. A free people must be able to prepare before receiving the blow.
Why Federalist 25 matters in the larger Publius argument
Federalist 25 matters because it links military design to federal design. Hamilton's argument is that common defense, equal burden-sharing, and national authority either stand together or fall apart together.
The essay also reaches back to Federalist 8. There Hamilton warned that disunion would push Americans toward standing armies and harsher institutions. Here he explains why a stronger Union is actually the safer way to hold military power under law.
If you want the broader Hamilton frame, go back to the Hamilton authority page. If you want the next moves in sequence, read Federalist 26, then continue to Federalist 27 and Federalist 28, where Hamilton explains how federal law can usually work through ordinary institutions and why the states and the people remain checks against usurpation.
What to read next
Primary sources and further reading
- The Federalist No. 25, [21 December 1787] | Founders Online — Hamilton's argument that common defense must remain national and that rigid peacetime prohibitions would leave the Union unable to prepare in time.
Related essays by theme
Use Federalist 25 to see Hamilton's national-defense logic at full scale
This is the essay where Hamilton says common danger requires common councils, common treasury, and real preparation before attack. Read it if you want the clearest founding case that weak federal defense is neither equitable nor safe.
Hamilton's argument against amateur defense still frames why the founders rejected a militia-only republic.