US legal system works like the British legal system.
two kinds of law, legislative and judicial. legislative is statutes. judicial is interpretation of the statute. people don't like the interpretation, they lobby their legislators to pass new statutes.
now, do your own homework.
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ok, sorry about that "homework" wisecrack.
Commerce complicates things a bit in the U.S., because each state has it's own laws (and its own taxing authority), but the US Constitution grants to Congress the right to regulate interstate commerce.
When a court issues a decision on a case, that decision becomes the "law of the land", and in every case that comes to court thereafter with similar circumstances, the court is bound by the decision of the earlier court. This is referred to as "precedent." The court decides whether the facts of the later case are "close enough" to be bound by an earlier case. If there is no precedent, then the court decides the case on its merits, and that decision becomes de facto law.
But one state court is not bound by the decisions of other state courts. Where two or more states have conflicting laws, a person (individual, corporation or other organization) may petition the US Supreme Court to hear the case. All states are bound by decisions of the US Supreme Court.
I said judges are bound by earlier decisions, but occasionally a decision is issued that is contrary to the established precedent. If the losing party appeals, an appellant court might or might not restore the precedent.
At any time, the legislature may pass a law that overturns a judicial precedent, which law then becomes the new "law of the land."
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