How case law can be used in US when every state has a different law?

  • How case law can be used in US when every state has a different law?

    Recently I read about common law and how it works. Two questions came into my mind:
    1- How case law can be used in US when every state has a different law? I mean some states have their own rules, then how can a case law of a different state be used in the other one?
    2- After the passing of new laws, how the new cases can be judged? based on previous case laws, or the newly passed law?

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