Sources of Law in the United States
Consititutions - US Constitiution establishes the fedral government and enumerates its powers. Powers not given to the federal government are reserved to the states. State constitutions establish state governments and enumerate t heir powers.
Treaties - the president, with the advice and consent of the Senate, may enter into treaties with foreigh countries.
Codified Law - statutes are enacted by the federal congress and state legislatures. Ordinances are passed by municipalities and local government bodies. They establish courses of conduct that must be followed by covered parties.
Executive Orders - issued by the president and governors of states, executive orders regulate the conduct of covered parties.
Regulations and Order of Administrative Agencies - Adminstrative agencies are created by the legislative and executive branches of government. They may adopt administrative regulations and issue orders.
Judicial Decisions - Federal and state courst decide controversies. In doing so, they issue decisions that state the holding of each case and the reasoning used by the court in reaching its decision.
Doctrine of Stare decisis - This doctrine provides for the adherence to precedent. Stare decisis means "to stand by the decision"