Statistics for occurrence #1 of “Northwestern Virginia” in chapter 2 of Maj. Jed. Hotchkiss, Confederate Military History, a library of Confederate States Military History: Volume 3, Virginia:

...st Virginia secessionists, those that by act of Congress, when its membership was almost exclusively Northern, seceded from Virginia in 1861, were mainly confined to the Trans-Appalachian counties of Northwestern Virginia , where there were but few slaves and still fewer slaveholders, and where the larger portion of the population was more in sympathy with the adjacent States of Ohio and Pennsylvania than with the res...
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