Cato Institute
Policy Analysis
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intended essentially to constitutionalize the natural
rights philosophy of the Declaration of Independence.
Lest it be thought that Justice Washington was
idiosyncratic in his choice of language, it is important
to note that for lawyers and educated laymen alike, "priv-
ileges and immunities" was a term of art.  In fact, in his
Commentaries on the Laws of England, William Blackstone,
the primary legal authority for the founding generation,
used the term in ways that fully support Washington's exe-
gesis.33   Discussing the "rights of Englishmen," Blackstone
wrote:
The rights themselves, thus defined by these sev-
eral statutes, consist in a number of private
immunities; which will appear to be indeed no
other, than either that residuum of natural
liberty, which is not required by the laws of
society to be sacrificed to public convenience;
or else those civil privileges, which society
hath engaged to provide, in lieu of the natural
liberties so given up by individuals.34
Here, Blackstone defines "privileges" and "immunities" by
pointing back explicitly to the natural law.  In fact, the
terms serve as an explicit bridge between the state of
nature and civil society, between natural rights and civil
rights: "immunities" are either the natural rights we
retain when we enter into civil society or those "privi-
leges" we gain at that time in exchange for surrendering
certain of our natural liberties.  To fully understand and
appreciate the idea of "privileges and immunities," there-
fore, we need a clear understanding of the theory of natu-
ral rights that underpins the American experiment in
ordered liberty--and the Declaration of Independence, in
particular.
Natural Rights, the Social Contract,
and the Foundation of American Constitutionalism
What then is the natural rights philosophy, which
earlier generations thought the Privileges and Immunities
Clause stood for?  As we saw in Corfield, the language of
the Declaration of Independence provided the standard
American expression of that philosophy.  It is useful to
begin, therefore, with the relevant passage of the
Declaration:
We hold these Truths to be self-evident, that
all Men are created equal, that they are endowed