Earlier quoted context omitted.
Left unchecked, globalization will likely lead to just a single huge shipworking company, or maybe two or three. Does that benefit shipworkers in either the US or Puerto Rico?
What makes you think so? There's plenty of approximately unchecked sectors of the economy. Eg software or computer hardware. There's plenty of companies in these sectors.
It's funny you mention computer hardware, because that just proves the parent's point - essentially all of it is made by either TSMC or Samsung.