A plain-language overview of how American law is made, how the court system is structured, and how a case actually moves from filing to resolution.
The United States has a federal system of government, meaning law-making power is split between the national (federal) government and the 50 individual states. Within each level, three branches share responsibility for creating, enforcing, and interpreting the law.
Congress (federal) and state legislatures write and pass statutes — the written laws you can look up, such as the U.S. Code.
The President, governors, and the agencies they oversee enforce statutes and issue detailed regulations that explain how a law applies in practice.
Courts interpret statutes and regulations when disputes arise, producing case law (also called precedent) that guides how similar future cases are decided. Browse real decisions in our case law search.
The U.S. actually runs two parallel court systems. Which one hears your case depends on the type of dispute and who's involved.
Hears cases involving federal law, the U.S. Constitution, disputes between states, or parties from different states where a significant amount is at stake.
Hears the vast majority of legal disputes in the U.S. — most family law, personal injury, criminal, and contract cases never touch federal court. Structure varies by state but generally follows this pattern. Browse your state's laws.
Nearly every legal matter falls into one of these two categories, and they work very differently.
While every case is different, most civil litigation follows these general stages.
The plaintiff files a complaint; the defendant responds with an answer, which may include their own counterclaims.
Both sides exchange evidence — documents, written questions (interrogatories), and sworn testimony (depositions) — to build their case.
Either side can ask the judge to rule on legal issues before trial, sometimes resolving the case entirely (e.g., summary judgment).
Most civil cases settle before trial. If not, the case proceeds to trial before a judge or jury, who hears evidence and reaches a verdict.
The court enters a final judgment. A party who believes the law was misapplied can appeal to a higher court, which reviews for legal error rather than re-trying the facts.
A quick reference for terms you'll run into often.
Dig into specific topics, search real case law, or find an attorney for your situation.
This guide provides general educational information about how the U.S. legal system works and is not legal advice. Laws and procedures vary by state — consult a licensed attorney about your specific situation.