I have been seeing memes online about the Irish having been slaves in the Americas. There's a fair amount of material online detailing the difference between the treatment of the Irish as indentured servants and African chattel slavery.
As I recall, African slavery started out as indentured servitude and became chattel slavery, but the Irish seem to have become part early American society. For example, Andrew Jackson, who was of Irish heritage, was elected in 1829.
How did the switch happen?