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handle is hein.crs/goveiba0001 and id is 1 raw text is: Congressional
'Research Service
Constitutional Limits on States' Power over
Foreign Affairs
August 15, 2022
The Constitution gives the federal government the primary power to manage the United States' foreign
relations. Article I, Section 10 prohibits states from engaging in a set of activities that implicate
international affairs, while the Supremacy Clause, Foreign Commerce Clause, and other constitutional
provisions place key elements of this power with the federal government. Interpreting these provisions,
the Supreme Court has described the United States' foreign affairs power not only as superior to the
states but residing exclusively in the national government. With respect to foreign relations, the Supreme
Court said that state lines disappear and the purpose of the State ... does not exist.
Despite this sweeping language, states and other subnational entities (e.g., cities and counties) play a
more prominent role in international relations than may be generally recognized. States have offices
overseas and send trade and diplomatic delegations to foreign countries. They have imposed economic
sanctions for human rights abuses and military aggression-most recently on Russia for invading
Ukraine. States regularly enter into written pacts with foreign governments on issues ranging from trade
to the environment to tourism. Some of these international pacts address potentially sensitive subjects,
such as border security with Mexico and technology transfers with the People's Republic of China (PRC).
A recent rise in pacts with PRC-based bodies led U.S. intelligence officials to warn state and local
governments about PRC efforts to exploit its relationships with subnational governments to promote its
geopolitical interests in the United States.
The Supreme Court has held that the Constitution constrains states' ability to act on the global stage, but
much of the state-driven international activity is not publicized or presented to Congress. Because
Congress may have an interest in optimizing and overseeing states' actions in this area, this Sidebar
discusses constitutional limits on states' role in international affairs and potential avenues for
congressional involvement.
Article I, Section 10
Article I, Section 10 of the Constitution contains a catalog of prohibitions and limitations on states'
power. Many of these restrictions relate to foreign relations. In particular, Clause 1 prohibits the states
from entering into any Treaty, Alliance, or Confederation. Clause 3-commonly called the Compact
Clause-requires Congress to approve any state's Agreement or Compact with a foreign Power, i.e.,
Congressional Research Service
https://crsreports.congress.gov
LSB10808
CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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