Almost all of the states, as well as the federal government, separately adopted and modified English common law as the basis for their bodies of law. The only e

Almost all of the states, as well as the federal government, separately adopted and modified English common law as the basis for their bodies of law. The only exception is Louisiana which adopted French and Spanish style Civil law. The Constitution isn’t a legal system in and of itself. Rather it sets out a system of government and gives one branch the power to make laws, another to execute them and veto new ones, and a third to supervise and rule on those laws (including setting up a court system).