As far as I know it is uncertain where Abraham was born. Many researchers list it as North Carolina, but that has not been proven. In 1786 he was in Tennessee per the birth of his son, Martin. He bought land in Kentucky in 1807. He died before 1823.
I am descended through Abraham's youngest son, Martin. Martin and most of his children spelled the name "Casaday".
Email me mcasaday(at)gmail.com and I'd be happy to give you all the notes I have on Abraham (shared with me by another researcher).
PS I am the same person as mdw18660 who you replied to.