Summary

Joseph McKenna Western Union Telegraph Company v…

Such a statute was plainly a regulation of interstate commerce, and exhibited in a conspicuous degree the evils of such interference by a state, and the necessity of one uniform plan of regulation. The statute of Michigan has no such objectionable qualities. It imposes no additional duty. It gives sanction only to an inherent duty. It declares that in the performance of a service public in its nature, that it is a policy of the state that there shall be no contract against negligence.
Source: Wikisource

Joseph McKenna Western Union Telegraph Company v…

So long as Congress has not legislated upon the particular subject, they are rather to be regarded as legislation in aid of such commerce, and as a rightful exercise of the police power of the state to regulate the relative rights and duties of all persons and corporations within its limits.'
'The statute now in question, so far as it concerns liability for injuries happening within the state of Iowa,-which is the only matter presented for decision in this case,-clearly comes within the same principles. It is in no just sense a regulation of commerce.
Source: Wikisource

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