Theories like this one do not explain how it is that immigrant groups do reasonably well. The history of the USA is filled with people who arrive with no money, poor language skills, sometimes traumatized - and yet wind up doing well within a generation or two.
https://en.wikipedia.org/wiki/List_of_ethnic_groups_in_the_U... is a good starting point to think about. Look at groups such as Vietnamese and Cambodians. They mostly arrived in my lifetime. Everything is against them. Poor language skills, widespread PTSD from what they witnessed, no savings - pretty bad picture.
And yet, look where they are today versus blacks. How did that happen?
https://en.wikipedia.org/wiki/List_of_ethnic_groups_in_the_U... is a good starting point to think about. Look at groups such as Vietnamese and Cambodians. They mostly arrived in my lifetime. Everything is against them. Poor language skills, widespread PTSD from what they witnessed, no savings - pretty bad picture.
And yet, look where they are today versus blacks. How did that happen?