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Your writer thinks the one true Southern tradition is conservative and libertarian, against the federal government and maybe just against government, against foreign wars and maybe just against wars.
Apparently, he never heard of Madison, Jackson and Polk: Wars against Britain and Mexico, Jacksonian Democracy, Westward Expansion, Manifest Destiny.
And if he's heard of Wilson, Truman, and Lyndon Johnson, he may not think of them as real Southerners. Maybe they weren't 100% Southern, but they certainly weren't New Englanders or New Yorkers.
Still don't see what this has to do with Wagner and Hitler, though.