The author needs to read some Thomas Sowell. No examination of Americans of Asian or Indian descent? How absurd.
Sociologists make a distinction between voluntary immigrants and involuntary immigrants.
People who come to any country on their own tend to do well, those who are forced into another country do not do well.
I am certain that Thomas Sowell understands this distinction.
Native Americans are involuntary immigrants, even though they are a special case where the foreign country came to them...