Browse 6 supremacy clause cases decided by Ninth Circuit. AI-powered summaries, holdings, and legal analysis.
Ninth Circuit Upholds Federal Authority Over Immigration Enforcement
United States v. State of California, decided by Ninth Circuit on April 22, 2026, resulted in a defendant win outcome. The Ninth Circuit affirmed the district court's grant of summary judgment to the ...
Ninth Circuit: Trump Not Immune from Defamation Suit for Personal Statements
State of Oregon v. Trump, decided by Ninth Circuit on October 28, 2025, resulted in a plaintiff win outcome. The Ninth Circuit Court of Appeals affirmed the district court's denial of former President...
Ninth Circuit Upholds Washington's Independent State Grounds Doctrine
Curtis v. Inslee, decided by Ninth Circuit on October 6, 2025, resulted in a defendant win outcome. The Ninth Circuit affirmed the district court's dismissal of a challenge to Washington's "independen...
Ninth Circuit Upholds Injunction Against South Dakota's "Sanctuary Cities" Law
Immigrant Defenders Law Center v. Noem, decided by Ninth Circuit on July 18, 2025, resulted in a plaintiff win outcome. The Ninth Circuit reviewed a district court's decision to grant a preliminary in...
Ninth Circuit Blocks South Dakota's Immigration Law
Al Otro Lado v. Kristi Noem, decided by Ninth Circuit on May 14, 2025, resulted in a plaintiff win outcome. The Ninth Circuit reviewed a district court's decision regarding a challenge to South Dakota...
Ninth Circuit Affirms Federal Authority Over Water Rights on Federal Lands
United States v. State of Idaho, decided by Ninth Circuit on March 13, 2025, resulted in a defendant win outcome. The Ninth Circuit reviewed Idaho's challenge to the federal government's authority to ...
CaseLawBrief currently tracks 6 supremacy clause cases from Ninth Circuit. This number is updated as new opinions are published.
Outcome breakdown: Defendant Win: 3, Plaintiff Win: 3.
Each case page on CaseLawBrief includes an AI-generated plain English summary, key holdings, and legal analysis. Click any case above to read its full analysis.