His inability to grasp this essential principle in effect, what America represents is deeply embedded in his character.
I'll disagree with the author's assertion of "birthplace settled", but that's an aside.
The cited quote can be summarized as "He may or may not have been 'born' an American. What is indisputable is that he was not 'raised' an American".
Excellent point
“He may or may not have been ‘born’ an American. What is indisputable is that he was not ‘raised’ an American”.
This is the 100% truth of the matter. He was not raised as an American. His worldview from the time he was a child was not American. It was continually reinforced through his adolescence and adulthood.