Cassirer v. Thyssen-Bornemisza Collection Foundation
The Court held that, in a suit raising non-federal claims against a foreign state or instrumentality under the Foreign Sovereign Immunities Act, a court should determine the substantive law by using the same choice-of-law rule applicable in a similar suit against a private party.
142 S. Ct. 1502 · No. 20-1566 · 2021 term · Roberts Court
Decided Apr 21, 2022 · argued Jan 18, 2022
Private action · Personal property
Majority opinion: Elena Kagan
The voteMajority
9–09 in the majority, 0 in dissent
No dissent (9–0)
Vacated and remanded. Cassirer won.
What this ruling means
Vacated and remanded: the Supreme Court set aside the decision of the U.S. Court of Appeals, Ninth Circuit, wiping it out without necessarily saying the result was wrong, and sent the case back for that court to decide again under the right legal standard.
Cassirer was the petitioner, the side that asked the Supreme Court to review the case. “Won” means the Court gave that side the result it asked for.
From the Supreme Court Database. A justice who agreed with the result but not the reasoning counts in the majority.
Summary
The opening of the case’s Wikipedia article: what the case was about and what the Court held.
Cassirer v. Thyssen-Bornemisza Collection Foundation, 596 U.S. 107 (2022), was a United States Supreme Court case in which the Court held that, in a suit raising non-federal claims against a foreign state or instrumentality under the Foreign Sovereign Immunities Act, a court should determine the substantive law by using the same choice-of-law rule applicable in a similar suit against a private party.
Data notes
The text is Wikipedia’s (CC BY-SA 4.0), matched to the case by its citation, docket number or name and year, and is not checked against the opinion. The site keeps the article’s opening section, ending on its last full sentence. The one-sentence summary under the title is the Decisions list’s: Wikipedia’s own ruling sentence, or, tagged “AI-written”, one Claude wrote from this opening.
How the justices voted
Each justice who took part, placed by their Martin–Quinn ideology score for the 2021 term. Filled: the 9 in the majority. Hollow: the 0 in dissent. Colour is the party of the president who appointed them.
Majority(9)
Elena KaganWrote the majority opinion
Sonia SotomayorJoined the majority
Stephen BreyerJoined the majority
John RobertsJoined the majority
Brett KavanaughJoined the majority
Neil GorsuchJoined the majority
Amy BarrettJoined the majority
Samuel AlitoJoined the majority
Clarence ThomasJoined the majority
Dissent(0)
- None.
Data notes
Each justice’s vote and what they wrote are from the justice-centered file of the Supreme Court Database. “Wrote a concurrence” means the justice sided with the majority and wrote separately; a justice who dissented in part is counted on the side they took overall. A justice who wrote nothing is listed as joining their side.
Positions are each justice’s Martin–Quinn score for the case’s term, the same scores as the Ideology page: negative is more liberal, positive more conservative. A score sums up a justice’s votes across the whole term, so it says where they usually sit, not why they voted as they did here. The median line is the Court’s median justice that term.
The parties
Who brought the case to the Court, who answered it, and how it got there.
- Petitioner
- CassirerOwner, landlord, or claimant to ownership, fee interest, or possession of land as well as chattels
- Respondent
- Thyssen-Bornemisza Collection FoundationForeign nation or instrumentality
- Reached the Court by
- Certiorari (the Court chose to hear it)
- Why it was taken
- Federal appeals courts had ruled differently on the question
Data notes
The names are the two sides of the case’s title. The description under each is the Supreme Court Database’s category for that party, in its own wording. The petitioner is the side that asked the Supreme Court to review the decision below. “Why it was taken” appears only when the majority opinion says lower courts disagreed or were unsure about the question; reasons that would fit any case (“to resolve the question presented”, “an important question”) are left out.
The law at issue
The law the Court was asked to apply, and the kind of power it used to decide.
- Provision
- Foreign Sovereign Immunities Act
- Kind of law
- Infrequently litigated statutes
- Decided by
- Statutory construction
Data notes
The Supreme Court Database codes the main constitutional provision, statute or court rule each case turned on, and the basis of the decision: judicial review of a federal or state law, interpreting a statute, supervising the lower courts, and so on. A case can rest on more than one. “Overruled” counts only where the majority opinion says so.
Timeline
What happened at the Court and how the case got there, newest first.
- Apr 21, 2022DecidedDecided · Decided 9–0: vacated and remanded. Cassirer won.
- Jan 18, 2022ArguedArgued · Oral argument before the Court.
- Not datedTaken upTaken up · The Supreme Court agreed to hear the case (certiorari). Federal appeals courts had ruled differently on the question.
- Not datedCourt belowCourt below · Decided by the U.S. Court of Appeals, Ninth Circuit: affirmed.
- Not datedBeganBegan · The case began in the California Central U.S. District Court.
Data notes
From the Supreme Court Database: the court the case began in, the court whose decision the Supreme Court reviewed and what that court did, how the case came to the Court, and the dates of argument and decision. The database does not date the steps in the lower courts. Court names are the database’s.
Official record
Read the argument audio on Oyez and Wikipedia. Case data from the Supreme Court Database, Version 2026 Release 01, through the 2025 term.