I learned from my recent reading (Bio of Jefferson Davis, IIRC) that this was also true to some extent during the Civil War. Some poor whites, trying to cope with hard times made much worse by the war, figured that they could do better for their families by going north to find a job than by enlisting or being conscripted into the confederate army.
Very interesting.
I’m finally reading “The Red Badge of Courage.” I picked it off the shelf the other day when I was looking for something small to read on the elliptical trainer. Another week at the gym, and I should finish it!