Who or what decides whether a state's individual laws or federal laws apply in a disputed situation?

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Explanation:

In its choice of the applicable law, the court that exercises jurisdiction determines which law to apply to a case that involves foreign parties, foreign transactions, or a number of foreign elements. In a simple world, the court would always apply its own law, the law of the forum (known in Latin as the lex fori).

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there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.