West Virginia was overrun by Union troops in 1861. These were some of the few significant Union victories in the first two years of the Civil War. Since there was no cotton crop in West Virgina, slave labor was not especially useful and there were few slaves. B/c there was no cotton crop and few slaves, people in West Virginia had no good reason to align thmselves with the ideals of the Confederacy. When the troops of General George McClellen defeated the hapless Rebels in western Virginia in 1861 (just after the war had begun), it looked to the people of western VA that the Confederacy were going to be the ultimate losers, and that the benefits of remaining part of the rich and prosperous Union were obvious. It was a no-brainer.