<P> (The Constitutional Reform Act also renamed the Supreme Court of Judicature of Northern Ireland to the Court of Judicature, and the rarely cited Supreme Court of Judicature for England and Wales as the Senior Courts of England and Wales). </P> <P> The Supreme Court was set up in 2009; until then the House of Lords was the ultimate court in addition to being a legislative body, and the Lord Chancellor, with legislative and executive functions, was also a senior judge in the House of Lords . </P> <P> The Supreme Court of the United States, established in 1789, is the highest Federal court in the United States, with powers of judicial review first asserted in Calder v. Bull (1798) in Justice Iredell's dissenting opinion . The power was later given binding authority by Justice Marshall in Marbury v. Madison (1803). There are currently nine seats on the US Supreme Court . </P> <P> Each U.S. state has a state supreme court, which is the highest authority interpreting that state's law and administering that state's judiciary . Two states, Oklahoma and Texas, each have two separate highest courts that respectively specialize in criminal cases and civil cases . Although Delaware has a specialized court, the Court of Chancery, to hear cases in equity, it is not a supreme court because the Delaware Supreme Court has appellate jurisdiction over it . </P>

Describe the primary function of the united states supreme court