United States Constitution 

Constitution of the United States: Analysis and Intrepretation 

Although the Constitution of the United States is a fairly brief document, it is broad in scope. It defines the structure of the U.S. legal system by allocating power and responsibility among the three branches of government and describes its fundamental principles, including separation of power, checks and balances, and shared authority of federal and state governments.  As the "supreme Law of the Land" all other laws must be written in accordance with and are subordinate to the Constitution.  Constitutional research often focuses on historical background, interpretation by the courts, scholarly analysis, and legislative action rather than actual constitutional language. The Declaration of Independence is the prelude document to the Constitution.