The American sources of law

Constitutional Law is based on a formal document that defines broad powers. Federal constitutional law originates from the U.S. Constitution. State constitutional law originates from the individual state constitutions.

Statutes and Ordinances are legislation passed on the federal, state, or local levels.

Common Law is based on the concept of precedence - on how the courts have interpreted the law. Under common law, the facts of a particular case are determined and compared to previous cases having similar facts in order to reach a decision by analogy. Common law applies mostly at the state level. It originated in the 13^th century when royal judges in England began recording their decisions and the reasoning behind the decisions.

Administrative Law - federal, state, and local level. Administrative law is made by administrative agencies that define the intent of the legislative body that passed the law.

The sources of law have both vertical and horizontal dimensions. Vertical dimensions include federal authority, state authority, and concurrent authority. Federalism refers to this form of government, in which there is national and local authority. Federal authority covers laws related to patents, pensions and profit sharing, and labour issues. State authority covers business association, contracts, and trade secrets. Concurrent authority covers security law, tax law, and employment law. Note that employment law refers to non-union relationships; labour law refers to union relationships.

The horizontal dimension is related to the separation of power between the executive branch, which creates administrative law, the legislative branch, which creates statutes, and the judicial branch, which creates common law. The judicial system in the U.S. has a pyramid structure.