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Law of the United States


 
 


The law of the United StatesUnited States

The United States of America, also known as the United States, the U.S., the U.S.A., and America, is...
was originally largely derived from the common lawCommon law

The common law forms a major part of the law of many countries, especially those with a history as British territories or co...
 system of English lawEnglish law

English law is a formal "term of art" that describes the law for the time being in force in England and Wales....
, which was in force at the time of the Revolutionary WarAmerican Revolutionary War

The American Revolutionary War , also known as the American War of Independence, was a war between Great Britain and r...
. However, the supreme law of the land is the United States ConstitutionUnited States Constitution

The United States Constitution is the supreme law of the United States of America....
 and, under the Constitution's Supremacy ClauseSupremacy Clause

Article VI, Paragraph 2 of the United States Constitution is known as the Supremacy Clause:...
, laws enacted by Congress and treatiesTreaty

A treaty is a binding agreement under international law entered into by actors in international law, namely states and inter...
 to which the U.S. is a party. These form the basis for federal lawFederal law

Federal law is the body of law created by the federal government of a nation....
s under the federal constitutionFederation

A federation is a union comprised of a number of partially self-governing states or regions united by a central government....
 in the United States, circumscribing the boundaries of the jurisdiction of federal law and the laws in the fifty U.S. stateU.S. state

A state of the United States is any one of the fifty subnational entities referred to as a state which, along with the Dist...
s and territories.
General overview
Sources of lawIn the United States, the law is derived from four sources.






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The law of the United StatesUnited States

The United States of America, also known as the United States, the U.S., the U.S.A., and America, is...
was originally largely derived from the common lawCommon law

The common law forms a major part of the law of many countries, especially those with a history as British territories or co...
 system of English lawEnglish law

English law is a formal "term of art" that describes the law for the time being in force in England and Wales....
, which was in force at the time of the Revolutionary WarAmerican Revolutionary War

The American Revolutionary War , also known as the American War of Independence, was a war between Great Britain and r...
. However, the supreme law of the land is the United States ConstitutionUnited States Constitution

The United States Constitution is the supreme law of the United States of America....
 and, under the Constitution's Supremacy ClauseSupremacy Clause

Article VI, Paragraph 2 of the United States Constitution is known as the Supremacy Clause:...
, laws enacted by Congress and treatiesTreaty

A treaty is a binding agreement under international law entered into by actors in international law, namely states and inter...
 to which the U.S. is a party. These form the basis for federal lawFederal law

Federal law is the body of law created by the federal government of a nation....
s under the federal constitutionFederation

A federation is a union comprised of a number of partially self-governing states or regions united by a central government....
 in the United States, circumscribing the boundaries of the jurisdiction of federal law and the laws in the fifty U.S. stateU.S. state

A state of the United States is any one of the fifty subnational entities referred to as a state which, along with the Dist...
s and territories.

General overview


Sources of law

In the United States, the law is derived from four sources. These four sources are constitutional lawUnited States constitutional law

United States Constitutional Law is the body of law governing "the interpretation and implementation of the United States Co...
, administrative lawAdministrative law

Administrative law is the body of law that arises from the activities of administrative agencies of government....
, statutory lawStatutory law

Statutory law is written law set down by a legislature or other governing authority such as the executive branch of governm...
, and the common law (which includes case lawCase law Overview

Case law is the body of judge-made law and legal decisions that interprets prior case law, statutes and other legal authorit...
). The most important source of law is the United States ConstitutionUnited States Constitution

The United States Constitution is the supreme law of the United States of America....
. All other law falls under, and is subordinate to, that document. No law may contradict the Constitution. For example, if Congress enacts a statute that conflicts with the Constitution, the Supreme CourtSupreme Court of the United States

The Supreme Court of the United States is the highest judicial body in the United States and leads the judicial branch of th...
 may find that law unconstitutional, and declare it invalid.

Notably, a statute does not disappear automatically merely because it has been found unconstitutional; it must be deleted by a subsequent statute. Many federal and state statutes have remained on the books for decades after they were ruled to be unconstitutional. However, under the principle of stare decisisStare decisis

Stare decisis is a Latin legal term, used in common law to express the notion that prior court decisions must be recogni...
, no sensible lower court will enforce an unconstitutional statute, and any court that does so will be reversed by the Supreme Court. Conversely, any court that refuses to enforce a constitutional statute (where such constitutionality has been expressly established in prior cases) will risk reversal by the Supreme Court.

Also, certain practices traditionally allowed under English common law were outlawed by the Constitution, such as bills of attainderBill of attainder

A bill of attainder is an act of legislature declaring a person or group of persons guilty of some crime, and punishing them...
 and general search warrants.

American common law

The United States and most CommonwealthCommonwealth of Nations

The Commonwealth of Nations, usually known as the Commonwealth, is a voluntary association of 53 independent sovereign...
 countries are heirs to the common lawCommon law

The common law forms a major part of the law of many countries, especially those with a history as British territories or co...
 legal tradition of English lawEnglish law

English law is a formal "term of art" that describes the law for the time being in force in England and Wales....
; for example, U.S. courts have inherited the principle of stare decisisStare decisis

Stare decisis is a Latin legal term, used in common law to express the notion that prior court decisions must be recogni...
.

English law was formally "received" into the United States in several ways. First, all U.S. states except Louisiana have enacted "reception" statutes which generally state that the common law of England (particularly judge-made law) is the law of the state to the extent that it is not repugnant to domestic law or indigenous conditions. Some reception statutes impose a specific cutoff date for reception, such as the date of a colony's founding, while others are deliberately vague. Thus, contemporary U.S. courts often cite pre-Revolution cases when discussing the evolution of an ancient judge-made common law principle into its modern form, such as the heightened duty of care traditionally imposed upon common carrierCommon carrier

A common carrier is an organization that transports persons or goods, and offers its services to the general public....
s.

Second, a small number of important British statutes in effect at the time of the Revolution have been independently reenacted by U.S. states. Two examples that many lawyers will recognize are the Statute of FraudsStatute of frauds

The statute of frauds refers to a statute , or a provision in a statute, in many common law jurisdictions that requires cert...
 (still widely known in the U.S. by that name) and the Statute of 13 Elizabeth (the ancestor of the Uniform Fraudulent Transfers Act). Such English statutes are still regularly cited in contemporary American cases interpreting their modern American descendants.

However, it is important to understand that despite the presence of reception statutes, much of contemporary American common law has diverged significantly from British Commonwealth common law. The reason is that although the courts of the various Commonwealth nations are often influenced by each other's rulings, American courts rarely follow post-Revolution Commonwealth rulings unless there is no American ruling on point, the facts and law at issue are nearly identical, and the reasoning is strongly persuasive.

Early on, American courts, even after the Revolution, often did cite contemporary English cases. This was because appellate decisions from many American courts were not regularly reported until the mid-19th century; lawyers and judges, as creatures of habit, used English legal materials to fill the gap. But citations to English decisions gradually disappeared during the 19th century as American courts developed their own principles to resolve the legal problems of the American people. The number of published volumes of American reports soared from eighteen in 1810 to over 8,000 by 1910. Today, in the words of Stanford law professor Lawrence Friedman: "American cases rarely cite foreign materials. Courts occasionally cite a British classic or two, a famous old case, or a nod to BlackstoneWilliam Blackstone

Sir William Blackstone, was an English jurist and professor who produced the historical and analytic treatise on the common ...
; but current British law almost never gets any mention."

Some adherents of originalismOriginalism

In the context of United States constitutional interpretation, originalism is a family of theories which share the starting ...
 and strict constructionismStrict constructionism

Strict constructionism is a philosophy of judicial interpretation and legal philosophy that limits judicial interpretation t...
 such as Justice Antonin ScaliaAntonin Scalia

Antonin Gregory Scalia is an American jurist and the second most senior Associate Justice of the Supreme Court of the United...
 of the United States Supreme CourtSupreme Court of the United States

The Supreme Court of the United States is the highest judicial body in the United States and leads the judicial branch of th...
 argue that American courts should never look for guidance to post-Revolution cases from legal systems outside of the United States, regardless of whether the reasoning is persuasive, with the sole exception of cases interpreting international treatiesTreaty

A treaty is a binding agreement under international law entered into by actors in international law, namely states and inter...
 to which the United States is a signatory. This position follows inevitably from the philosophy of originalism, which posits not only that the Constitution is the ultimate source of judicial authority in the U.S., but that the only proper analysis of the document consists of discerning the document's original meaning at the time of its adoption. Therefore, discussion of British law that postdates the Constitution is irrelevant as it sheds no light on the original meaning of the Constitution. Others, such as Justices Anthony KennedyAnthony Kennedy

Anthony McLeod Kennedy has been an Associate Justice of the U.S....
 and Stephen BreyerStephen Breyer

Stephen Gerald Breyer is an American attorney, political figure, and jurist....
, disagree, and cite foreign law from time to time, where they believe it is informative, persuasive, useful or helpful. However, foreign law has never been cited as binding precedent, but merely as a reflection of the shared values of Anglo-American civilization or even Western civilization in general.

Federal law

Federal law originates with the Constitution, which gives Congress the power to enact statuteStatute

A statute is a formal, written law of a country or state, written and enacted by its legislative authority, perhaps to then ...
s for certain limited purposes like regulating interstate commerce. Nearly all statutes have been codified in the United States CodeFacts About United States Code

The United States Code is a compilation and codification of the general and permanent federal law of the United States....
. Many statutes give executive branch agencies the power to create regulationRegulation

A regulation is a legal restriction promulgated by government administrative agencies through rulemaking supported by a thre...
s, which are published in the Federal RegisterFederal Register

The Federal Register is a publication of the United States Government that contains most routine publications and public not...
 and codified into the Code of Federal RegulationsCode of Federal Regulations

The Code of Federal Regulations is the codification of the general and permanent rules and regulations published in the Fede...
. Regulations generally also carry the force of law under the Chevron doctrineChevron U.S.A., Inc. v. Natural Resources Defense Council, Inc.

Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc., 467 U.S....
. Many lawsuits turn on the meaning of a federal statute or regulation, and judicial interpretations of such meaning carry legal force under the principle of stare decisisStare decisis

Stare decisis is a Latin legal term, used in common law to express the notion that prior court decisions must be recogni...
.

State law



The fifty American states are separate sovereignsSovereignty

Sovereignty is the exclusive right to exercise supreme political authority over a geographic region, group of people, or on...
 with their own state constitutions and state governmentState government

A state government is the government of a subnational entity in States with federal forms of government, which shares politi...
s. They retain plenary powerPlenary power

A plenary power or plenary authority is the complete power of a governing body....
 to make laws covering anything not preempted by the federal Constitution, federal statutes, or international treaties ratified by the federal Senate.

Nearly all states started with the same British common law base, with the notable exception of Louisiana; Louisiana lawLouisiana law

Law in the state of Louisiana is based in part on civil law....
 has always been strongly influenced by the French Napoleonic CodeNapoleonic code

The original Napoleonic Code, or Code Napolon , was the French civil code, established at the behest of Napolon I....
. The passage of time has resulted in enormous diversity in the laws of the states. State courts have expanded the old common law rules in different directions (through their traditional power to make law under the doctrine of stare decisisStare decisis

Stare decisis is a Latin legal term, used in common law to express the notion that prior court decisions must be recogni...
), and state legislatures have passed various statutes expanding or overriding many judge-made rules.

Many American states have codified some or all of their statutory law into legal codeLegal code

A legal code is a body of law written and enforced by a state....
s. Codification was an idea borrowed from the civil law through the efforts of American lawyer David Dudley Field. New YorkNew York

New York is a state in the northeastern United States....
's codes are known as "Laws." CaliforniaCalifornia

California is a state spanning the southern half of the west coast of the contiguous United States....
 and TexasTexas

Texas is a state in both the Southern and Western region of the United States of America....
 simply call them "Codes." Other states use terms such as "Revised Statutes" or "Compiled Statutes" for their compilations. California, New York, and Texas have separate subject-specific codes, while all other states and the federal government use a single code divided into numbered titles.

In some states, codification is often treated as a mere restatement of the common law. Judges are free to liberally interpret the codes unless and until their interpretations are specifically overridden by the legislature. In other states, there is a tradition of strict adherence to the plain text of the codes.

The advantage of codification is that once the state legislatureLegislature

A legislature is a type of representative deliberative assembly with the power to adopt laws....
 becomes accustomed to writing new laws as amendments to an existing code, the code will usually reflect democratic sentiment as to what the current law is (though the entire state of the law must always be ascertained by reviewing case law to determine how judges have interpreted a particular codified statute).

In contrast, in jurisdictions with uncodified statutes, like the United KingdomUnited Kingdom

The United Kingdom of Great Britain and Northern Ireland is a country and sovereign state that lies off the northwest coast...
, determining what the law is can be a more difficult process. One has to trace back to the earliest relevant Act of Parliament, and then identify all later Acts which amended the earlier Act, or which directly overrode it. For example, when the UK decided to create a Supreme Court of the United KingdomSupreme Court of the United Kingdom

The Supreme Court of the United Kingdom will be created under the provisions of the Constitutional Reform Act 2005 to take o...
, lawmakers had to identify every single Act referring to the House of LordsHouse of Lords

The House of Lords is the upper house of the Parliament of the United Kingdom....
 that was still good law, and then amend all of those laws to refer to the Supreme Court.

Criminal law

In the arena of criminal lawCriminal law Summary

Criminal law is the body of statutory and common law that deals with crime and the legal punishment of criminal offenses....
, all states have somewhat similar laws in regard to "higher crimes" (or felonies), such as murderMurder

A Murder is the unjust, immoral and/or illegal killing of another human being....
 and rapeRape

Rape is the act of forcing penetrative sexual acts, against another's will through violence, force, threat of injury, or oth...
, although penalties for these crimes may vary from state to state.

For public welfare offenses where the state is punishing merely risky (as opposed to injurious) behavior, there is significant diversity across the various states. For example, punishments for drunk driving varied greatly prior to 1990. State laws dealing with drug crimesRecreational drug use

Recreational drug use is the use of psychoactive drugs for recreational purposes rather than for work, medical or spiritual ...
 still vary widely, with some states treating possession of small amounts of drugs as a misdemeanor offense or as a medical issue and others categorizing the same offense as a serious felony.

Tort law

United States tort lawUnited States tort law

Under United States tort law, torts are generally divided into three categories: intentional torts, negligence, and strict l...
 varies widely across the states. For example, a few jurisdictions allow actions for negligent infliction of emotional distressNegligent infliction of emotional distress

The tort of negligent infliction of emotional distress is a controversial legal theory and is not accepted in many United St...
 even in the absence of physical injury to the plaintiff, but most do not. For any particular tort, states differ on the causes of action, types and scope of remedies, statutes of limitations, and the amount of specificity with which one must plead the cause. With practically any aspect of tort law, there is a "majority rule" adhered to by most states, and one or more "minority rules."

Attempts at "uniform" laws

Efforts by various organizations to create "uniform" state laws have been only partially successful. The two leading organizations are the American Law InstituteAmerican Law Institute Overview

The American Law Institute was established in 1923 to promote the clarification and simplification of American common law an...
 (ALI) and the National Conference of Commissioners on Uniform State LawsNational Conference of Commissioners on Uniform State Laws

The National Conference of Commissioners on Uniform State Laws is a non-profit unincorporated association in the United Stat...
 (NCCUSL). The most successful and influential uniform laws are the Uniform Commercial CodeUniform Commercial Code

The Uniform Commercial Code is one of the uniform acts that has been promulgated in attempts to harmonize the law of sales a...
 (a joint ALI-NCCUSL project) and the Model Penal CodeModel Penal Code

The Model Penal Code is a statutory text which was developed by the American Law Institute in 1962....
 (from ALI).

Apart from model codes, the American Law InstituteFacts About American Law Institute

The American Law Institute was established in 1923 to promote the clarification and simplification of American common law an...
 has also created Restatements of the LawRestatement of the Law

The Restatements of the Law are published by the American Law Institute as scholarly refinements of black letter law....
 which are widely used by lawyers and judges to simplify the task of summarizing the current status of the common law. Instead of listing long, tedious citations of old cases (in order to invoke the long-established principles contained in those cases), they can simply cite a Restatement section to refer to a particular common law principle.

Local law


States have delegated lawmaking powers to thousands of agenciesGovernment agency

A government agency is a permanent or semi-permanent organisation in the machinery of government that is responsible for the...
, townshipTownship

The term township is used to denote a lower level territorial subdivision....
s, countiesCounty

A county is generally a sub-unit of regional self-government within a sovereign jurisdiction....
, citiesCity

A city is an urban area that is differentiated from a town, village, or hamlet by size, population density, importance, or ...
, and special districts. And all the state constitutions, statutes and regulations are subject to judicial interpretation like their federal counterparts.

Thus, at any given time, the average American citizen is subject to the rules and regulations of several dozen different agencies at the federal, state, and local levels, depending upon one's current location and behavior.

Odd exceptions

As noted above, much of Louisiana lawLouisiana law

Law in the state of Louisiana is based in part on civil law....
 is derived from the Napoleonic CodeNapoleonic code

The original Napoleonic Code, or Code Napolon , was the French civil code, established at the behest of Napolon I....
; the adherence to French legal traditions stems from its time as a French colonyFrench colonization of the Americas

French colonization of the Americas began in the 16th century, and continued as France established a colonial empire in the ...
. Puerto RicoPuerto Rico

The Commonwealth of Puerto Rico , also Porto Rico and more commonly Puerto Rico, is a United States territory w...
 is also a civil lawCivil law (legal system)

Civil law is system of law that has its origins in Roman law and sets out a comprehensive system of rules, usually codified,...
 jurisdiction of the United States. However, the criminal law of both jurisdictions has been necessarily modified by common law influences and the supremacy of the federal Constitution.

Many states in the southwest that were originally Mexican territory have inherited several unique features from the civil law that governed when they were part of Mexico. These states include ArizonaArizona

Arizona is a U.S. state located in the Southwestern United States....
, CaliforniaCalifornia

California is a state spanning the southern half of the west coast of the contiguous United States....
, NevadaNevada

Nevada is a state located in the western United States, best known for its widespread legalization of gambling and gaming in...
, New MexicoNew Mexico

New Mexico is a southwestern state in the United States of America....
, and TexasTexas

Texas is a state in both the Southern and Western region of the United States of America....
. For example, these states all have a community propertyCommunity property

Community property is a marital property regime that originated in civil law jurisdictions, and is now also found in some co...
 system for the property of marriedMarriage

A marriage is a relationship between or among individuals, usually recognized by civil authority and/or bound by the religio...
 persons. Another example of civil law influence in these states can be seen in the California Civil Code, where the law of contracts is treated as part of the law of obligationsFacts About Law of obligations

The Law of Obligations is one of the component elements of the civil law system of law and encompasses contractual obligatio...
 (though the rules actually codified are clearly derived from the common law).

Many of the western statesWestern United States Overview

The Western United States, also referred to as the American West or simply The West, traditionally refers to the...
, including California, ColoradoColorado

Colorado is a state in the western United States....
, New MexicoNew Mexico

New Mexico is a southwestern state in the United States of America....
, and WyomingWyoming

Wyoming is a state of the western United States....
 use a system of allocating water rights known as the prior appropriation doctrinePrior appropriation water rights

Prior appropriation water rights, sometimes known as the "Colorado Doctrine", is a system of allocating water rights from a ...
, which is derived from Spanish civil law. It should be noted that each state has modified the doctrine to suit its own internal conditions and needs.

Innovations

"American law is, by international standards, a series of innovations and exceptions... the United States has charted a distinctive and idiosyncratic legal path."

Several legal innovations first arose in the United States, and some of those innovations have been adopted by other countries.

The most broadly influential innovation of 20th century American law was the rule of strict liabilityStrict liability

Strict liability is a legal doctrine that makes a person responsible for the damage and loss caused by their acts and omissi...
 for defective productsProduct liability

Product liability encompasses a number of legal claims that allow an injured party to recover financial compensation from th...
, which originated with judicial glosses on the law of warrantyWarranty

In business law, a warranty is a promise that something sold is as factually stated or legally implied by the seller....
. In 1963, Roger J. TraynorRoger J. Traynor

Roger John Traynor served as the 23rd Chief Justice of the Supreme Court of California from 1964 to 1970, and as an Associat...
 of the Supreme Court of CaliforniaSupreme Court of California

The Supreme Court of California is the state supreme court in California....
 threw away legal fictionLegal fiction Summary

In the common law tradition, legal fictions are suppositions of fact taken to be true by the courts of law, but which are no...
s based on warranties and imposed strict liability for defective products as a matter of public policyPublic policy

Public policy is a course of action or inaction chosen by public authorities to address a problem....
 in the landmark case of Greenman v. Yuba Power Products.. The American Law InstituteFacts About American Law Institute

The American Law Institute was established in 1923 to promote the clarification and simplification of American common law an...
 subsequently adopted the Greenman rule in Section 402A of the Restatement (Second) of Torts, which was published in 1965 and was very influential throughout the United States. Outside the U.S., the rule was adopted by the European Economic Community in the Product Liability Directive of July 1985, by Australia in July 1992, and by Japan in June 1994.

By the 1990s, the avalanche of American cases resulting from Greenman and Section 402A had become so complicated that another restatement was needed, which occurred with the 1997 publication of the Restatement (Third) of Torts: Product Liability.

See also

  • Legal systems of the worldLegal systems of the world

    The four major legal systems of the world today consist of civil law, common law, customary law, and religious law....
  • Black's Law DictionaryBlack's Law Dictionary

    Black's Law Dictionary is the definitive law dictionary for the law of the United States....


Lists


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External links

  • at Cornell University's Legal Information Institute