Except when executing spies, traitors, and deserters, what was the sole acceptable mode of execution in the United States for a century after the adoption of the Eighth Amendment?

Question

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Hanging was the sole acceptable mode of execution in the United States for a century after the adoption of the Eighth Amendment, except when it came to executing spies, traitors, and deserters.

Except When Executing Spies, Traitors, and Deserters, What Was the Sole