Does anyone know where to find copyright-free Civil War Era instrumental music?

I am currently making a YouTube video about the American Civil War and I'd like to know if there is a good source of copyright-free Civil War music. I am particularly looking for simple instrumental tunes, no lyrics. Ideally, it would be like something from Ken Burn's The Civil War series, but I can't use music from that because then the video would get copyright claimed.

Nothing AI generated please, or AI involved.

Thanks for your help.

UPDATE: I have found a YouTube channel that has some of The Civil War series that are not included in the offical soundtrack. Only a few video, but they are exactly what I need. I'll update later to see if these songs will get copyright claimed. In the meantime, here's a link: https://youtube.com/@unlistedcivilwarsountrac-mi3eg

UPDATE: The videos found in the YouTube channel mentioned above don't seem to be copyright claimed. I put them all into a single test video, uploaded it twice, and got no claims.