Possibly the template that announces Jefferson Finis Davis was a United States President could be altered to signify he was the sole President of the Confederate States of America?
Admitted, later on, scrolling down, there is a note that he was Pres. of the Confederate States of America but it's the one at top that is apparently causing some disturbance. I think it can be altered. Because that's what he was and not a Pres. of the United States. There is a distinction, to be sure.