I have two ancestors from North Carolina who were abolitionist Quakers. They joined a Union regiment of Carolinians. After the War they migrated north to Indiana, where they were active in the Grand Army of the Republic.
There was a lot of independent people of high ideals in the South who overcame great hardships to even reach the US Army.
In contrast to the mass of more reluctant southerners conscripted into the Confederate army, these dedicated men did not desert in large numbers when the going got tough.