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I agree with this -- most people just aren't *aware* that Southern Unionists even existed, even if they are direct descendants. I grew up in the Deep South, and always assumed my ancestors fought for the Confederacy, and only recently learned that I descend from a Southern Unionist from Marion County, Alabama (1st Ala. Cav).
I've been discussing this topic with a lot of people recently, and most of them are fairly well educated, but are neverthless surprised to learn that many white southerners joined up with the Union. I certainly don't remember ever learning about it in school, and if it was mentioned, it was only in passing and I had no idea that there were significant numbers of southerners who did this. But now that I know about it, I am interested in learning more about this part of my family history, but there doesn't seem to be much out there, especially when compared to other Civil War topics.
It would not surprise me to find out that a lot of southerners with diehard "Rebel" leanings actually descend from Southern Unionists, unbeknownst to them. I'm sure some of them are driving around with Confederate flag bumper stickers on their pickups. ;)