OK, OK, it’s Snopes; but Snopes says it’s not by Dr. Minzey, and is a mishmash of several viral emails.
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Hold on...I replied too fast...Snopes???
That is a Left wing wacko site...they’d not want to have a professor being conservative...so I doubt Snopes.
Well, maybe you’ll accept the site TruthOrFiction, which also says it’s misattributed to Minzey:
https://www.truthorfiction.com/jack-minzmodern-civil-war/