Common Law in the United States

The U.S. is a common law country. In all states except Louisiana (which is based on the French civil code), the common law of England was adopted as the general law of the state, EXCEPT when a statute provides otherwise. Common law has no statutory basis; judges establish common law through written opinions that are binding on future decisions of lower courts in the same jurisdiction. Broad areas of the law, most notably relating to property, contracts and torts are traditionally part of the common law. These areas of the law are mostly within the jurisdiction of the states and thus state courts are the primary source of common law. Thus, 'common law' is used to fill in gaps. Common law changes over time, and at this time, each state has its own common law on many topics. The area of federal common law is primarily limited to federal issues that have not been addressed by a statute.