A nice piece of revisionism has been issued by UNC Press called The Won Cause. It's a study of the Union's veteran organization, the Grand Army of the Republic, with an emphasis on interracial activities. I counted 468 integrated posts in the appendix, including venues in Kentucky and Missouri. As one of the chapter titles says, these were associations where balck and white citizens mingled on a basis of equality. Let's see whose oxen are gored.
The editor of the series that issued this title is Gary Gallagher. He has shown (over time) very good judgement in manuscript selection, I have to say.