The the U.S. Constitution was used to strike down the definition of marriage as per the Defense of Marriage Act (DOMA).

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The Due Process Clause of the 5th Amendment was used to strike down Section 3 of the Defense of Marriage Act, which defined marriage as between one man and one woman for federal purposes. The Supreme Court ruled that this violated the due process rights of same-sex couples who were legally married under state law. The First and Fourth Amendments were not directly implicated in this case, and the Supremacy Clause was not the basis for the ruling.

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