Not a lot of people know this, but some white Americans were slaves in Africa. Actually the US Navy was founded to free white American slaves held in North Africa. And actually white Abolitionists used stories of white American slaves in Africa to point at the problem of black slaves in America.

https://medium.com/lessons-from-history/unknown-history-the-us-navy-was-founded-to-free-white-slaves-in-north-africa-33ab5e36c096