Questions should be decided at the lowest level capable of handling them, with three
exceptions: where a right is at stake, where the effects spill across borders, and where
competition between states would drive a standard below what any of them would choose
alone. The warrant is that proximity, diversity and the possibility of experiment are real
advantages that should govern by default, and that each exception identifies a specific
condition under which they fail.
The default deserves a defense, since it is frequently treated as a relic. A state
deciding a question is closer to the people affected, can accommodate genuinely different
preferences across a large and varied country, and generates evidence about what works
that a single national answer forecloses. Exit matters too: a person who dislikes their
state's policy may move, which is difficult but possible, whereas leaving a country
usually is not. None of these arguments depends on any romance about states' rights; they
are practical claims about information and choice.
The first exception is rights, and it is not close. Where a state is the entity
threatening a right, it cannot also judge whether the right has been violated, because the
whole purpose of a right is protection against the government making the decision. A
minority denied the vote by its own state has no other appeal within that state, and exit
is not a remedy for disenfranchisement. This is the entire history of incorporation: until
the Bill of Rights was applied to the states through the Fourteenth Amendment, a citizen's
protection against their own state came only from that state's constitution, interpreted
by that state's courts.
The second exception is spillovers, and it can be stated arithmetically. Suppose a
factory produces 40,000,000 in local benefit and 60,000,000 in pollution damage spread
across four states. The host state weighs 40,000,000 of benefit against the 15,000,000 of
damage falling on itself and approves. The nation loses 20,000,000. The state's decision
is entirely rational given what it bears and wrong from the national point of view, and no
amount of good faith corrects it, because the error is in whose costs enter the
calculation.
The third exception is competitive pressure. Each state that lowers a standard to attract
employers gains them from its neighbors, so all lower them, and every state ends at a
level none would have chosen if choosing alone. This is a genuine dynamic and it must be
limited carefully, because the same reasoning would justify nationalizing nearly every
question on which states compete, which is almost all of them. It should apply only where
the competitive pressure is strong and the standard protects something important.
Applying the principle to specific questions shows it does real work. A rural speed limit
is local: costs and benefits fall on local users, conditions vary, and no national answer
would fit better. Voting rights are national: it is a rights case and the state is the
threat. Interstate pollution is national: the spillover is most of the effect. School
curriculum is mostly state: preferences genuinely differ and fifty approaches generate
evidence one could not, with mobility supplying a weak argument for a national floor
rather than national control.
The strongest objection is historical and it must be met directly. States' rights was the
constitutional argument for slavery and later for segregation, and a principle that
returns questions to states by default carries that history. Anyone advancing it should
acknowledge that the argument has been used to defend the worst things in American
history, and that this is not an accident of rhetoric: the doctrine was genuinely
load-bearing in those defenses.
The answer is that the rights exception does the necessary work, and it does so by
design rather than by convenient exception. Slavery and segregation were not marginal
cases requiring the principle to be stretched; they are the paradigm case of a state
being the entity that threatens a right, which is precisely when the default yields.
A principle whose first exception disposes of the objection's central examples is not
evading them.
It should also be said that the historical record cuts both ways, which a student
defending either level uniformly will miss. States have protected speech, criminal
procedure and privacy beyond federal minimums, and have acted where the national
government would not. The federal government enforced desegregation and also operated
internment. Neither level is inherently virtuous, which is exactly why the argument should
be about which level should decide a particular question rather than which is
better.
One further application tests the principle usefully. Lesson 4.3 established that
thirteen states holding a small share of the national population can block any
constitutional amendment. On the subsidiarity principle that is defensible, since
constitutional change binds every state permanently and should require broad agreement
among them rather than a bare national majority. On a purely majoritarian principle it is
indefensible. Both principles are in the Constitution, and noticing that the framework
does not settle everything is more honest than pretending it does.
The position, then, is that federalism is a structure rather than a value, and the useful
question is never whether states or the nation should be stronger in general. It is who
bears the costs of this decision, whether a right is threatened by the government that
would make it, and whether competition would drive the answer somewhere nobody wants.
Those three questions decide most cases, and where they conflict the disagreement is real
rather than a failure to apply the principle correctly.