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In page Fourteenth Amendment to the United States Constitution:

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Beginning with Allgeyer v. Louisiana (1897),[1] the U.S. Supreme Court interpreted the Due Process Clause as providing substantive protection to private contracts, thus prohibiting a variety of social and economic regulation; this principle was referred to as "freedom of contract".[citation needed] A unanimous court held with respect to the noun "liberty" mentioned in the Fourteenth Amendment's Due Process Clause: