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I'm from the South and my accent is entirely about the vowel sounds. I defy these Midwesterners who think me uneducated to catch me in a usage error. Meanwhile, these Midwesterners love to say "acrost!" I even heard the House Doctor (I think he's from California) say "acrost" on national television!
(scanning furiously for usage errors before I hit "send..." oh dear, where do I put the close-parentheseeeeee....)