I have never seen this in any contemporary documents.

Thanks for posting it. It looks like they used the 1860 census and totalled up all the foriegn born males and used a percentage calculation. The total number of 4,000 male Native Americans for the Union would be nearly ALL (regardless of age) male Native Americans living in the Union States excluding California and Oregon. For the Confederate South, Louisiana had the largest foreign born male group at 45,000, then Texas at 25,000, and Virginia at 20,000. My numbers are of all foriegn or Native American males, and not broken down by age. I think I need to study this more closely.

David