American Court System
Why it Matters
A judgment can be flawless on the law and still count for nothing. If the court that entered it lacked the power to hear the case, the ruling is void, however strong the claim behind it. Federalism splits that power between two systems running side by side, one federal and one in each state, each tiered from a trial court up to a court of last resort. Their authority overlaps in places, so a single dispute can belong to the state system, the federal system, or both. A lawyer or paralegal settles that question first, because the wrong courthouse makes every hour spent inside it worthless.
Current Context
On February 24, 2026, a unanimous Supreme Court erased a federal judgment and sent the case back to the state court where it started (opens in a new tab). A Texas family had sued a baby food maker and the in-state grocer that sold the product, and the maker removed the case to federal court on diversity grounds. The district court dropped the grocer as improperly joined, the maker won at trial, and the Fifth Circuit then held the grocer belonged in the suit. Complete diversity had therefore been missing since the day of removal, and Justice Sotomayor wrote for the Court that a district court cannot create jurisdiction through its own mistakes (opens in a new tab). Five years of litigation ended where it began.
Key Concepts
Dual Court System
Two judicial systems covering the same ground: the federal courts, and the separate courts of each of the fifty states. One person standing in one place answers to both at once, because the nation and the state each make law and each needs courts to apply it.
Jurisdiction
A court’s legal authority to hear and decide a case. A court without it cannot bind anyone, so jurisdiction is the threshold question, settled before the merits.
Subject Matter Jurisdiction
A court’s authority over the type of dispute in front of it. State courts hold general authority and hear nearly any kind of legal claim; federal courts hold limited authority and reach only what the Constitution or Congress grants them.
Federal Question Jurisdiction
The authority of federal courts, under 28 U.S.C. § 1331, to hear cases arising under the U.S. Constitution, a federal statute, or a treaty. It is one of the two main doors into federal court. The federal issue generally has to appear in the plaintiff’s own well-pleaded claim, so a federal defense alone does not open that door.
Diversity Jurisdiction
The authority of federal courts, under 28 U.S.C. § 1332, to hear civil cases between citizens of different states when the amount in controversy exceeds $75,000. Diversity must be complete: no plaintiff may share a home state with any defendant. The purpose is a neutral forum for the out-of-state party.
Concurrent Jurisdiction
The overlap in which state and federal courts both hold authority over the same case, which leaves the choice of forum to the plaintiff. A defendant sued in state court on a claim that could have been filed federally can sometimes remove it to federal court.
Trial Court
The court of original jurisdiction, where a case starts, evidence comes in, and a judge or jury decides what happened. In the federal system these are the U.S. district courts; in Florida they are the circuit and county courts.
Appellate Court
A court that reviews a lower court’s decision for legal error on the record already made, rather than retrying the case or taking new evidence. Review at the top, by a state supreme court or the U.S. Supreme Court, is usually discretionary, which means the court picks the cases it takes.
Resources
- Comparing Federal & State Courts (U.S. Courts) (opens in a new tab) (Official side-by-side of how the two systems are created, how each is structured, and what cases each hears: the core map for this activity.)
- Court Role and Structure (U.S. Courts) (opens in a new tab) (The federal judiciary’s own account of the Article III courts and how the district, circuit, and Supreme Court levels fit together.)
- Subject Matter Jurisdiction (Cornell LII, Wex) (opens in a new tab) (Plain-language explainer of both federal question and diversity jurisdiction, with the statutes cited so you can read them yourself.)
- 28 U.S.C. § 1332, Diversity of Citizenship (Cornell LII) (opens in a new tab) (The diversity statute itself, including the $75,000 amount-in-controversy threshold you will cite in your post.)
- Florida Courts: Court Structure (flcourts.gov) (opens in a new tab) (Official structure of Florida’s state courts: the county courts, the circuit courts, the district courts of appeal, and the Supreme Court of Florida.)
- Introduction to the Federal Court System (U.S. DOJ) (opens in a new tab) (Covers original jurisdiction, the overlap with state courts, and removal, which is the ground the Local Grounding and Jurisdiction Stress-Tester prompts work over.)
- YouTube: Overview of the American Legal System (UVA Law) (opens in a new tab) (A 39-minute lecture on federalism and separation of powers, the design that produces two court systems at once.)
- YouTube: Overview of the American Legal System and the Life of a Case (UVA Law) (opens in a new tab) (Follows one dispute from filing through appeal, so you can watch a case climb the tiers you are mapping.)
What to Do
This activity makes you a legal geographer. You will have an AI map the dual court system onto real places, name the courts that serve them, and sort disputes between the two systems. Then you check its work against the courts’ own sites, because a court name that sounds official is not the same as a court that exists. The habit you are building is treating a confident AI answer as a draft.
Part 1: Build the Map
Start with the structure itself. Run the Structure Explainer for an account of how federalism produces two tiered court systems and how subject matter jurisdiction sorts cases between them. Then run Local Grounding (Daytona Beach) to put that structure where you live. It traces a purely local dispute through the Florida courts, and a federal claim through the federal courts instead. Read the output closely and write down every court it names, because names like these are what you verify in Part 3.
Part 2: Test the Boundary
Jurisdiction is not fixed. Change the parties or the legal theory and a case can cross from one system to the other. Run the Jurisdiction Stress-Tester, answer its question about a civil or criminal scenario, and have it explain in proper terms why the case belongs where it says. Keep running it until one fact pattern moves a case cleanly across the line, whether a state-law dispute picks up a federal question or the parties’ citizenship opens diversity jurisdiction. Write down the exact reasoning the AI gives, because Part 4 asks you to judge it.
Part 3: Verify Against the Real Courts
Now test the map against the courts themselves. Run the Court Identifier and Verifier and have it name the state and federal trial and appellate courts that serve two U.S. cities of your choosing. Then verify each name yourself, using the state judiciary’s own site for the state courts and uscourts.gov for the federal district and circuit. For each city, confirm the trial court, the intermediate appellate court, and the court of last resort. Record anything the AI got wrong, invented, or left vague.
Part 4: Post (400–600 words)
Write up your expedition. Open with the most interesting fact pattern the Jurisdiction Stress-Tester produced: summarize the scenario, then explain the AI’s reasoning for placing it in state or federal court, using terms like federal question and diversity jurisdiction. Then say whether that reasoning held up. Next, describe what the Court Identifier and Verifier told you about your two cities and how you checked it, naming the official sites you used to confirm or correct each answer. Close on what mapping and checking taught you: where the dual court system sits across the country, and how far you can trust an AI on a question this precise.
Part 5: Share Chat Link
Include one AI chat link with a 1–2 sentence explanation of what the conversation shows and why you chose to share it.
Suggested AI Prompts
Use these prompts as a starting point, then adjust them to fit your goal. Strong prompting develops through trial, revision, and testing. It’s a foundational skill that grows into more advanced AI work such as context engineering and agent-based workflows.
Structure Explainer
You are explaining the American court system to a college student in an Introduction to Law course who has no legal background. In full paragraphs, explain how federalism creates two parallel court systems, one federal and one for each state, and how each is tiered into trial courts, intermediate appellate courts, and a court of last resort. Explain how subject matter jurisdiction sorts cases between the systems: what gives a federal court authority (federal question under 28 U.S.C. § 1331 and diversity under § 1332) versus what stays in state court, and what concurrent jurisdiction means. Define every legal term the first time you use it, and keep the explanation accurate without dumbing it down.
The move here is role assignment with a named audience: the prompt says who the writing is for and refuses to let a term go undefined. Both halves earn their place, because a model aimed at no one in particular will either talk down to you or bury you in jargon it never explains.
Local Grounding (Daytona Beach)
I live in Daytona Beach, Florida, which is in Volusia County. Show me how the dual court system applies to where I live by tracing two cases from start to finish. First, a purely state-law dispute, such as a fight over a local parking ordinance during a Daytona International Speedway race: name the specific Florida trial court where it begins, the intermediate appellate court it would be appealed to, and the highest state court that could review it. Second, a federal claim, such as a suit under the Endangered Species Act over sea turtle protections on the beach: name the specific federal district court where it is filed, the federal circuit court it is appealed to, and the final court that could hear it. Use correct court names and the terms original jurisdiction, appellate jurisdiction, and venue. Then flag any point where you are unsure of the exact court name so I know what to verify.
Anchoring the prompt to a real county and two real scenarios is source grounding, and it forces out court names you can check rather than theory you cannot. The closing instruction turns the model’s own uncertainty into your verification list.
Jurisdiction Stress-Tester
First, ask me whether I want a criminal or a civil scenario, and wait for my answer. Then generate a short, realistic fact pattern that clearly belongs in either state or federal court, and explain in proper legal terms why, citing subject matter jurisdiction, personal jurisdiction, or the nature of the claim. Next, change one fact or legal theory and explain how that change moves the case into the other system, for example by adding a federal question, creating diversity of citizenship over $75,000, or raising a constitutional claim. Keep the legal terminology exact and write in full paragraphs.
Making the model ask before it answers is Socratic elicitation, so the scenario is built around your answer instead of an average student’s. Changing one fact and tracing the consequence is decomposition: move a single piece, then see whether jurisdiction still holds.
Court Identifier and Verifier
Ask me to enter any U.S. city and state. Once I do, name the official state trial court, state intermediate appellate court (if one exists there), and state court of last resort that serve that location, and then the federal district court, federal circuit court of appeals, and the U.S. Supreme Court. For each court, give the exact official name and one sentence on whether it exercises original or appellate jurisdiction. Important: do not guess. If you are not certain of an official court name, say so explicitly rather than inventing one, and tell me which official website I should check to confirm it.
Demanding exact official names and an explicit admission of doubt is uncertainty elicitation, and it builds the verification step into the prompt itself. Language models invent court names that read exactly right, so treat every name this one returns as a claim to check against the state judiciary’s site and uscourts.gov.