[central_va]

THe South didn't keep records as accurately when volunteers enlisted. The Richmond fire burned a lot of records. So I only have anecdotal evidence to say that the converse was probably true, as many border state residents and northerners fought for the Confederacy. There are cemeteries filled in Maryland and West Virginia of old Rebels.

My mother worked in Maryland for the Montgomery County Public Schools, whose first director was a confederate Calvary Officer that died in the 1910's the name was Anderson I think.

[BroJoeK]

central_va: "So I only have anecdotal evidence to say that the converse was probably true, as many border state residents and northerners fought for the Confederacy."

No doubt that's true -- Maryland, Western Virginia, Kentucky and Missouri, to name a few, all supplied substantial troops to the Confederate Army.

How many they supplied, and what percentages went South versus North is probably debatable.
Somewhere I saw numbers for Maryland suggesting two served the Union for every one in the Confederate Army -- or more-or-less the reverse of Confederate states like Tennessee and North Carolina.

As for more sympathetic "Doughface" Northern states, like Pennsylvania, Indiana and Illinois -- I've never seen numbers, if there are any, on Confederate troops from those areas.