Full Faith and Credit
Article IV, section 1, of the Constitution provides that "Full Faith and Credit shall be given in each State to the public Acts, Records and judicial Proceedings of every other State; And the Congress may by general Laws prescribe the Manner in which such Acts, Records and Proceedings shall be proved, and the Effect thereof." This provision was designed to unify the nation by binding together its several states.
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It states that "Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State." This was placed into the Constitution by its framers in order to make sure to protect the autonomy of each state. It upholds the principle that laws or judgments enacted in one state should be honored by the other states, even though we were united as the United States. Criminals in one state would be recognized as criminals in another. Marriages in one state were valid in all the others,and so on.
The "Full Faith and Credit Clause" (Article IV) stipulates that all states within the union must respect "public acts, records, and judicial proceedings of every other state." The clause also states that "Congress may by general laws prescribe the manner in which such acts, records, and proceedings shall be proved, and the effect thereof."
A driver's license from one state is still valid if you drive through other states.