intrastate commerce if it has an impact on inter-
state activities (id. at 196). Moreover, “[t]his power,
like all others vested in Congress, is complete in
itself, may be exercised to its utmost extent, and
acknowledges no limitations, other than are pre-
scribed in the constitution” (id. at 197).
From 1887 to 1937, however, the Supreme Court
espoused a more circumscribed view of Congress’s
commerce power. Under this view, known as dual
federalism, federal and state governments are
separate sovereigns with separate zones of author-
ity, and it is the judiciary’s role to demarcate and
enforce these separate spheres. The Supreme
Court of this era narrowly defi ned commerce as
an element of business distinguishable from other
elements such as “mining” or “manufacturing”—
zones of interest reserved to the states (U
NITED
STATES V. E.C. KNIGHT CO., 156 U.S. 1 [1895]). The
Court also narrowly defi ned “among the several
States,” permitting Congress to regulate only
activity having a direct effect on interstate com-
merce (S
WIFT & CO. V. UNITED STATES, 196 U.S. 375
[1905]). And it interpreted the Tenth Amendment
to reserve to the states certain zones of interest,
such as local trade and manufacture, beyond the
scope of Congress’s commerce power (H
AMMER V.
D
AGENHART [The Child Labor Case], 247 U.S. 251
[1918]). Applying this framework, the Court invali-
dated a broad array of federal laws, including New
Deal legislation enacted under President Franklin
Roosevelt.
These decisions relied on formalistic distinc-
tions that many Americans perceived as arbitrary
and even inhumane in light of the Great Depres-
sion’s bleak economic realities. To address this
problem, President Franklin Roosevelt proposed
in 1936 to increase the Supreme Court’s size from
nine to 15 justices. The president abandoned this
“court packing” proposal after Justice Owen Rob-
erts changed his vote in NLRB
V. JONES & LAUGH-
LIN STEEL CORP., 301 U.S. 1 (1937), forming the
fi fth member of a new majority willing to expand
Congress’s commerce power. The change is aptly
known as “the switch in time that saved nine.”
Jones & Laughlin upheld Congress’s authority
to regulate intrastate activities that “have such a
close and substantial relation to interstate com-
merce that their control is essential or appropri-
ate to protect that commerce from burdens and
obstructions” (id. at 37).
The Court fully retreated from its narrow
interpretation of the commerce power in U
NITED
S
TATES V. DARBY LUMBER CO., 312 U.S. 100 (1941),
and W
ICKARD V. FILBURN, 317 U.S. 111 (1942).
Darby explicitly rejected the view that production
was a zone of interest reserved to the states, and it
expressly overruled Hammer v. Dagenhart’s hold-
ing that the Tenth Amendment affi rmatively limits
Congress’s commerce power. “The [Tenth] amend-
ment states but a truism that all is retained which
has not been surrendered” (Darby, 312 U.S. at
124). Wickard, in turn, expressly rejected earlier
distinctions between direct and indirect effects on
interstate commerce (317 U.S. at 124).
This broad interpretation survived for almost
60 years: between 1937 and 1995, the Supreme
Court did not invalidate a single federal law as
exceeding Congress’s commerce power. (See, e.g.,
Hodel v. Virginia Surface Mining & Reclama-
tion Assn., Inc., 452 U.S. 264 [1981], upholding
Congress’s authority to regulate strip mining on
intrastate land not part of interstate commerce,
even though such regulation historically had been
the province of the states, and H
EART OF ATLANTA
MOTEL INC. V. UNITED STATES, 379 U.S. 241 [1964],
upholding Congress’s authority to prohibit dis-
crimination in places of public accommodation.)
Then, in UNITED STATES V. LOPEZ, 514 U.S. 549
(1995), the Court shocked many by invalidating
a provision of the Gun-Free School Zones Act of
1990 criminalizing the possession of a handgun
within 1,000 feet of a school. The Court explained
that the interstate commerce clause authorizes
Congress to regulate three categories of activities:
1) the use of the channels of interstate commerce;
2) instrumentalities of interstate commerce, or
persons or things in interstate commerce, even
though the threat may come only from intrastate
activities; and 3) intrastate activities having a
substantial relation to interstate commerce (514
U.S. at 558–59). Only the third category was rel-
evant in Lopez. The Court held that because the
criminalization of mere possession of a handgun
“has nothing to do with commerce or any sort of
386 interstate commerce
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