How Much Power Do U.S. Courts Have Over International Law?
How much authority do U.S. courts actually have to apply international law directly? It's a question that sounds academic until it isn't — it shapes how American courts handle everything from treaty disputes to the recognition of foreign judgments, and it has been contested, inconsistently, for decades.
A new book from Gary B. Born, International Law in American Courts (Kluwer Law International), argues that the current approach is "gravely flawed" — not just as policy, but as a matter of constitutional interpretation. Born's case: the current treatment of international law by U.S. courts departs from the Constitution's text and history, and from how American courts treated international law for the 200 years following ratification.
The book's central claim is worth sitting with. Born argues that all rules of international law — what the Framers called the "law of nations" — are part of the "Laws of the United States" under Articles III and VI of the Constitution. That includes both public international law (the rights and duties of nations) and private international law (how far U.S. courts' jurisdiction extends over foreign parties, and how foreign judgments are treated domestically).
But there's a check on this: individual rules only become directly applicable in U.S. courts once the political branches make them "self-executing." It's a framework that treats treaties, international agreements and customary international law consistently — rather than the patchwork approach that has developed in practice.
For anyone teaching, practicing, or adjudicating in this space, it's a serious re-statement of first principles — the kind of book that reframes how you read the next foreign-relations case that crosses your desk.
Q&A
Q: What is the book's core argument?
A: That international law is part of the "Laws of the United States" under the Constitution, and that current U.S. judicial practice has drifted from that original framework.
Q: What does "self-executing" mean here?
A: A rule of international law that the political branches have authorized courts to apply directly, without further legislative action.
Q: Does the book cover both public and private international law?
A: Yes — it treats both as part of the same body of federal law, distinct from other legal domains like contract or property law.
Q: Who is Gary B. Born?
A: A leading authority on international arbitration and international law, publishing with Kluwer Law International.
Q: Who should read this?
A: Legal academics, international law practitioners, judges, and government legal advisers working on foreign relations law.