How rich or poor “America” is is something no one really cares about. The people who pretend to care do so to avoid saying the policy they propose will make themselves rich, often at the expense of a larger number of other Americans. That's quite obviously the case when capitalists support policies designed to constrain increases in skilled labor prices and thereby inflate capital returns.
This is not a knock on the article content, which is good (though not without problems), but the headline addressing an abstraction that is always a distraction from real interests.