Explore court systems, opinions, and legal trends for every U.S. state. Compare state and federal jurisdiction, find binding precedent for your state, and browse landmark state cases.
Browse 51 states and territories. Each state page surfaces the courts, judges, leading practice areas, and recent opinions for that jurisdiction — a one-stop view of the legal landscape for any state in the United States.
Every U.S. state has its own constitution, its own legislature that enacts statutes, its own court system, and its own body of judicial decisions interpreting state law. Federal law sets a floor in many areas — most prominently the rights protected by the U.S. Constitution and federal civil-rights statutes — but state law fills in the vast remainder of day-to-day legal life. Marriage and divorce, contracts, criminal prosecutions, real estate, employment under state statutes, professional licensing, the rules governing local governments and school districts: all of these are predominantly creatures of state law.
As a result, a single legal question can have 51 different answers. The age of consent, the rules for forming a binding contract, when a tenant can withhold rent, the elements of a particular tort, the legality of certain professional practices, the procedures for changing a name, the requirements for forming a limited-liability company — all of these can vary substantially across state lines. This is why state-by-state legal research is essential whenever a question turns on state-law rules.
Each CaseLawBrief state page brings together the appellate courts of that state — supreme court and intermediate appellate courts — along with the recent opinions, common practice areas, and judges relevant to that jurisdiction. From any state page you can navigate into specific courts, into individual cases with full AI-generated analysis, or into cross-dimensional pages that combine state and topic for sharper research.
The Tenth Amendment to the U.S. Constitution reserves to the states (or to the people) any powers not delegated to the federal government. In practice this means the federal government has only enumerated and implied powers, while states have a broad reserved police power to legislate for the health, safety, and welfare of their residents. The Supremacy Clause of Article VI provides that valid federal law is the supreme law of the land — meaning that when state law and a valid federal statute or constitutional rule conflict, the federal rule wins.
In areas like immigration, foreign affairs, patents, copyrights, and admiralty, federal law dominates. In contracts, torts, family law, criminal prosecution, and most property law, state law dominates. Many areas — including environmental regulation, securities, employment, antitrust, and civil rights — have parallel federal and state schemes, with overlapping but distinct rules and procedures. Understanding which sovereign's law applies, and which court system has jurisdiction, is one of the foundational skills of American legal practice.
State courts can hear federal claims (with rare exceptions), but federal courts can hear state-law claims only in limited circumstances: principally diversity jurisdiction, supplemental jurisdiction in cases that already have a federal claim, or specific statutory grants. Even when a state-law case is in federal court, the substantive law applied is the law of the state where the federal court sits — that is the holding of Erie Railroad Co. v. Tompkins (1938).
If you are a practitioner, a state-specific research workflow is unavoidable. Filing a brief in a Texas state court requires Texas precedent; arguing a New York employment claim requires New York statutes and decisions; navigating a California contract dispute requires California Civil Code and California appellate authority. Even rules that sound alike across states often have important local twists — statutes of limitations vary, evidentiary rules differ, and pleading standards diverge.
For students and researchers, state-by-state browsing also helps you see how different jurisdictions approach the same underlying problem. Comparative work across states can reveal majority and minority rules, illuminate doctrinal trends, and identify the states where novel legal arguments are most likely to succeed. The 50 states function as a rolling natural experiment in legal policy — a structure Justice Brandeis famously called the "laboratories of democracy."
For journalists and the general public, knowing where a case was decided and under which jurisdiction's law is essential to understanding what it means. A ruling that "Florida courts have decided X" tells you something useful only if you know it does not necessarily apply in Georgia or Alabama. CaseLawBrief makes that geographic and jurisdictional context explicit on every page.
The U.S. Constitution leaves substantial authority to the states under the Tenth Amendment. Each state has its own constitution, legislature, and judiciary, free to adopt different statutes, rules of court, criminal codes, civil procedure, family-law regimes, property systems, and more. The result is 50 parallel legal systems with overlapping but distinct rules — which is why a legal answer correct in one state can be wrong in another.
Federal courts are courts of limited jurisdiction: they can only hear cases authorized by the Constitution or by Congress, including federal-question cases, diversity cases between citizens of different states above a monetary threshold, admiralty matters, bankruptcy, patent, and certain other categories. State courts are courts of general jurisdiction and can hear virtually any kind of dispute unless federal law makes the case exclusively federal. Many cases can be filed in either system.
Yes. State courts have full authority to interpret and apply the U.S. Constitution and federal law in cases before them. State court decisions on federal constitutional issues are subject to ultimate review by the U.S. Supreme Court, but federal district courts and Courts of Appeals do not act as appellate courts over state-court decisions on questions of state law.
Yes — quite often. Many state constitutions have explicit privacy provisions, broader free-speech protections, equal-rights amendments, and other clauses that go beyond the federal floor. State supreme courts can interpret these state-constitutional provisions to provide more protection than the U.S. Constitution requires, and the U.S. Supreme Court cannot override their interpretation of state law.
Estimates suggest more than 95% of all cases filed in the United States each year are filed in state court. State law dominates everyday legal life: contracts, torts, criminal prosecutions, family law, real estate, probate, business organization, professional licensing, and most regulation of healthcare, education, and insurance. Federal law plays a major role in commerce, civil rights, immigration, IP, and certain regulatory areas — but the bulk of legal activity is state-level.
Start with your state's supreme court — its decisions on state law are binding statewide. Then look at your state's intermediate appellate courts, whose published opinions also bind trial courts within their geographic jurisdiction. Decisions of other states' courts may be persuasive but are not binding. For federal questions arising in your state, the relevant U.S. Court of Appeals decisions bind federal district courts within that circuit.
Diversity jurisdiction allows a federal court to hear a case between citizens of different states (or between a U.S. citizen and a foreign party) where the amount in controversy exceeds $75,000. The case still applies state substantive law — under Erie Railroad v. Tompkins (1938), federal courts in diversity cases must follow the substantive law of the state in which they sit. Diversity is one of the most common ways state-law disputes end up in federal court.