The Full Faith and Credit Clause, clause of the constitution requires that states should normally recognize the laws, acts, and judicial decisions of other states.
Article IV deals with a separate topic: the relationships between the states, sometimes known as "horizontal federalism." In its first provision, known as the Full Faith and Credit Clause, every state is required to respect the laws and institutions of every other state because they are all a part of one country.
In other words, the United State Constitution, each state in the union is required to recognize the judicial decisions, public documents, and legislative actions of the other states.
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