Purely a matter of military age population, immigrants without a job and ex-slaves. Neither side had the edge on patriotism. Get over it.And yet the Union had no problems keeping their ranks filled as I pointed out before. The Confederate soldier had no out. He was in until he was killed or injured too badly to serve any more or the war ended. The Union soldier had no such problem. Once his enlistment was up then he could go home. When the 3 year enlistments ran out in the summer of 1864 the Union army could have melted away to nothing. Yet it didn't. The overwhelming majority of soldiers re-upped to see the job through. They kept the faith to the very end. So at the end of the day, I'd have to say that while 94% of the eligible draftees weren't 'really down with the program', the overwhelming of those who enlisted certainly were. And they were the ones who whipped the rebels and preserved the country as our forefathers gave it to us.