In In re Kemmler, what Amendment was used to uphold the constitutionality of using the electric chair as the method of execution?

Question

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The Supreme Court in In re Kemmler used the 14th Amendment to uphold the constitutionality of the electric chair, stating that it did not constitute cruel and unusual punishment under the 8th Amendment, which was applied to the states through the 14th Amendment.

In in Re Kemmler, What Amendment Was Used to Uphold