Jonathan Lighter wuxxmupp2000 at YAHOO.COM
Wed Jul 16 18:25:16 UTC 2008

OED has the familiar Civil War sense from 1862, but as "a disloyal citizen" generally it evidently remained in use for a long time:
1903 _Life_  XLI (May 14)  445: Any person who does not want a big navy is a pervert and a copperhead.

The American Dialect Society -

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