Add the language and cultural implications it is almost impossible for foreign service businesses to compete. Therefore the labor and cash flows tend to remain local. And this is the key. To truly create wealth a country has to provide opportunity for all its citizens. Manufacturing cannot do that.
Service industries do that rather well.
Most lower skilled, non-professionals cannot get skilled jobs. They can get unskilled service jobs. And begin to move up the economic opportunity ladder. A country's true economic measure is not of its richest members but its poorest. Many major economies have large segments of its population that are in marginal or abject poverty.