Civil litigation in the United States takes place across two parallel court systems — federal and state — with distinct rules, procedures, and institutional cultures. Federal courts apply the Federal Rules of Civil Procedure and the Federal Rules of Evidence uniformly. State courts operate under their own procedural codes, which vary significantly in discovery scope, motion practice, expert witness standards, and trial procedures.

Subject matter jurisdiction determines which system applies: federal question cases, diversity cases meeting the amount-in-controversy threshold, and constitutional claims proceed in federal court. The vast majority of civil litigation — contract disputes, tort claims, property matters, and business cases — is handled in state courts under state procedural and substantive law.

Local court rules, filing requirements, e-discovery protocols, and case management practices differ not just by state but often by county and by individual judge. An attorney with experience in the specific courts where your case will be litigated brings practical advantages that go beyond substantive legal knowledge. For class actions, multi-district litigation, and appeals, the precedents of the specific federal circuit or state appellate court controlling your jurisdiction matter directly. The state grid below links to litigation attorneys by jurisdiction.