Erie Railroad v. Tompkins · ¶20

“but law in the sense in which courts speak of it today does not exist without some definite authority behind it. The common law so far as it is enforced in a State, whether called common law or not, is not the common law generally but the law of that State existing by the authority of that State without regard to what it may.have been in England or anywhere else....

U. S. Reports, bound volume
U. S. Reports, volume 304, at 64 (Library of Congress) · transcription: Caselaw Access Project
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