CSA holds onto West Virginia

Something I've always wondered: what would be the best way for the CSA to keep the Union out of West Virginia, and what would be the wider effects on the war if they did?
 
There was no way the CSA could have hung onto western Virginia. The area was surrounded by the staunchly Unionist states of Pennsylvania and Ohio. The Union could easily bring in troops and supplies by the Baltimore and Ohio Railroad, while CSA had no easy way to bring troops across the mountains. The railroad was an important transportation link across the North, and the Union would make it a high priority to safeguard it by occupying western Virginia.
 
Something I've always wondered: what would be the best way for the CSA to keep the Union out of West Virginia, and what would be the wider effects on the war if they did?

By not having most of West Virginia's population being adamantly against secession, and counter seceding from Virginia...
 
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