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||The examples and perspective in this article may not represent a worldwide view of the subject. (December 2010)|
Federal law is the body of law created by the federal government of a country. A federal government is formed when a group of political units, such as states or provinces join together in a federation, surrendering their individual sovereignty and many powers to the central government while retaining or reserving other limited powers. As a result, two or more levels of government exist within an established geographic territory. The body of law of the common central government is the federal law.
United States 
The United States Constitution provides for a federal government that is superior to state governments with regard to its enumerated powers. These powers include the authority to govern international affairs, the currency and national defense. After the American Civil War, the Fourteenth Amendment applied the Constitution's Bill of Rights to state governments. Issues that arise under any legislation passed by Congress, an Executive Order of the President, or a decision of federal courts pursuant to the Constitution are governed by federal law.