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There are several resources that aim to provide an introduction to the U.S. legal system, some of which are written for LLMs or foreign lawyers; these books are collected directly below this paragraph. This page also includes resources specific to the federal and state court systems, as well as resources related to the common law, the system of law used in the U.S.
The U.S. has a common law legal system, which means that law is derived from judicial precedent (case law). Lower courts must follow the decisions of higher courts. This means that a decision by the U.S. Supreme Court (the highest court in the country) is binding on all federal courts. A decision by the Ninth Circuit is binding on all of the federal district courts within the Ninth Circuit.
The below resources provide overviews and introductions to U.S. common law.
Federal courts hear cases in which the United States is a party, cases that allege violations of the U.S. Constitution or federal law (federal question jurisdiction), and cases between citizens of different states if the amount in controversy exceeds $75,000 (diversity jurisdiction). Federal courts also have jurisdiction over bankruptcy, copyright, patent, and maritime law cases.
The federal court system consists of three levels:
For more information about each of the federal courts, federal court jurisdiction, and their role within the U.S. judicial system (including maps of each court's geographic coverage), please see the below resources, as well the books listed immediately below:
The structure of state court systems vary; and while they generally follow a structure similar to the federal court system in which they have trial level courts, appellate courts, and a supreme court/court of ultimate jurisdiction, there can be many differences. For a general overview of the state court system, see The Politics of State Courts, which "examines the American judicial process at the state and local levels and explains the effects of federalism on our legal system."
To locate information about a specific state court, try the following resources:
Many libraries also produce state-specific research guides for the state in which they are located; Google "research guide [state] law." Example: "research guide Colorado law."
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