West's Encyclopedia of American Law | International Law

The body of law that governs the legal relations between or among states or nations.

To qualify as a subject under the traditional definition of international law, a state had to be sovereign: It needed a territory, a population, a government, and the ability to engage in diplomatic or foreign relations. States within the United States, provinces, and cantons were not considered subjects of international law, because they lacked the legal authority to engage in foreign relations. In addition, individuals did not fall within the definition of subjects that enjoyed rights and obligations under international law.

A more contemporary definition expands the traditional notions of international law to confer rights and obligations on intergovernmental international organizations and even on individuals. The UNITED NATIONS, for example, is an international...