Slavery isn't a common cause either but it shouldn't be a states issue.
Abortion is healthcare and it shouldn't be a states issue. We the People do not want it to be a states issue and too many women have suffered and died from bad state laws as it is. And, of course, not everyone can afford to move amd no one knows if they'll need an abortion to save their life or not.
The issue of slavery, as does abortion, both has/had an underdog versus over dog dynamics; slave/unborn child versus slave owner/ body owner. Only the the Southern DNC in 1860 thought the country should allow legal slavery at the Federal level; favor the slave owners. Today they still take the side of the over dog. At least with the abortion issue, back to the states, this lowered the tension of a possible civil war. Slavery did not have that option and this led to slave states, wanting to leave the Union, which then led to lot of death, trying to keep the country whole. Had they let the states decide, only the DNC would still have slavery and abortion.
Interestingly, the pro-slave culture, did not see slaves as human, anymore than the modern DNC abortion culture sees the unborn as being human. It is almost like the DNC adapted the slavery playbook to the unborn; cross out the word slavery and write in the unborn. Slave owners liked to play god, having control over life or death. The same is now true of the unborn. Now these same demigods are trying to redefine male and female, even though this has a science base criteria objectified by DNA. We need to burn their playbook since it can still create injustice and underdogs.