<P> Federal law and treaties, so long as they are in accordance with the Constitution, preempt conflicting state and territorial laws in the 50 U.S. states and in the territories . However, the scope of federal preemption is limited because the scope of federal power is not universal . In the dual - sovereign system of American federalism (actually tripartite because of the presence of Indian reservations), states are the plenary sovereigns, each with their own constitution, while the federal sovereign possesses only the limited supreme authority enumerated in the Constitution . Indeed, states may grant their citizens broader rights than the federal Constitution as long as they do not infringe on any federal constitutional rights . Thus, most U.S. law (especially the actual "living law" of contract, tort, property, criminal, and family law experienced by the majority of citizens on a day - to - day basis) consists primarily of state law, which can and does vary greatly from one state to the next . </P> <P> At both the federal and state levels, with the exception of the state of Louisiana, the law of the United States is largely derived from the common law system of English law, which was in force at the time of the American Revolutionary War . However, American law has diverged greatly from its English ancestor both in terms of substance and procedure, and has incorporated a number of civil law innovations . </P> <P> In the United States, the law is derived from five sources: constitutional law, statutory law, treaties, administrative regulations, and the common law (which includes case law). </P> <P> Where Congress enacts a statute that conflicts with the Constitution, the Supreme Court may find that law unconstitutional and declare it invalid . </P>

Where did the us legal system originate from
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