Many of them were impressed into the Union army against their will, (What were they fighting for again?) and many of them were sent to die in the South because they always needed more men to throw against Lee's meat grinder.
You should read more history, and not just the stuff you can find on Wikipedia.
Sounds like we need to get you scheduled for your distemper booster.
Only 2% of the Union army were draftees. Over 20% of the Confederate army were draftees.