When domestic courts use international law as rules of decision, the international legal rules are set into into domestic law by a process sometimes called "incorporation".  Incorporation is generally governed by each domestic legal system's own constitutional law.  This course addresses the incorporation of international law into U.S. law by U.S. courts.  Rules about incorporation in the United States are easily divided into two groups:  those involving treaties and those concerning all other forms of international law, a category traditionally called in England and the U.S. "the law of nations".