<P> Under Article IV of the Constitution, which outlines the relationship between the states, each state is required to give full faith and credit to the acts of each other's legislatures and courts, which is generally held to include the recognition of most contracts and criminal judgments, and before 1865, slavery status . Under the Extradition Clause, a state must extradite people located there who have fled charges of "treason, felony, or other crimes" in another state if the other state so demands . The principle of hot pursuit of a presumed felon and arrest by the law officers of one state in another state are often permitted by a state . </P> <P> The full faith and credit expectation does have exceptions, some legal arrangements, such as professional licensure and marriages, may be state - specific, and until recently states have not been found by the courts to be required to honor such arrangements from other states . Such legal acts are nevertheless often recognized state - to - state according to the common practice of comity . States are prohibited from discriminating against citizens of other states with respect to their basic rights, under the Privileges and Immunities Clause . </P> <P> Under Article IV, each state is guaranteed a form of government that is grounded in republican principles, such as the consent of the governed . This guarantee has long been at the fore - front of the debate about the rights of citizens vis - à - vis the government . States are also guaranteed protection from invasion, and, upon the application of the state legislature (or executive, if the legislature cannot be convened), from domestic violence . This provision was discussed during the 1967 Detroit riot, but was not invoked . </P> <P> The Supremacy Clause (Article VI, Clause 2) establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the supreme law of the land . It provides that state courts are bound by the supreme law; in case of conflict between federal and state law, the federal law must be applied . Even state constitutions are subordinate to federal law . </P>

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