Federal and State Courts Divide the Work

American litigation begins with a question most other systems do not ask. Two complete court systems exist, and a case has to belong to one of them.

Two systems, not two levels

State courts and federal courts are parallel structures, each with its own trial courts, appellate courts and rules. Neither sits simply above the other.

State courts handle the great majority of disputes, covering most contract, property, family and injury matters arising under state law.

Federal courts are courts of limited authority, hearing categories of case defined by the Constitution and by legislation rather than anything brought to them.

Subject matter is one route in

Claims arising under federal law generally may be heard in federal court, which is why disputes about federal statutes and constitutional questions often appear there.

Many disputes involve both federal and state claims, and mechanisms exist for a single court to address related matters together.

How those mechanisms operate is procedural and technical, and the analysis differs by claim, which is why counsel is involved in the choice.

The parties provide another route

Disputes between citizens of different states can reach federal court under a separate basis, subject to requirements about the amount at stake.

The historical reasoning concerned confidence in a neutral forum where parties came from different places, and the mechanism remains a significant part of federal caseloads.

Thresholds and definitions are set by statute and change over time, so specifics should be confirmed rather than assumed from any general description.

Cases can move between the systems

A case filed in state court may in certain circumstances be moved to federal court by a defendant, and a party may seek to return it.

Those procedures have strict timing and requirements, which is why early decisions in a lawsuit often concern forum rather than the merits.

Forum affects juror pool, procedural rules, judicial resources and scheduling, so the choice has practical consequences beyond the label on the courthouse.

Which law applies is a separate question

A federal court hearing a state law claim generally applies that state's substantive law while following federal procedural rules.

The separation between substance and procedure sounds academic and produces real differences in how a case is conducted and decided.

None of this indicates where any particular dispute belongs. Rules vary, they change, and anyone with an actual claim needs a licensed attorney in their own state.