We've lost our competitive advantage in those fields. It's that simple.. and when that happens you have a choice A) become incredibly protectionist or B) take advantage of the cheapers goods and services to innovate and create new, higher paying jobs.
That's the problem. We want to sit back and b**** about how "they took r jobz" instead of creating new and better jobs. The only reason so much of our workforce HAD those high paying jobs in the first place was because we transitioned from a blue collar centric society to an educated and highly skilled one. If we still had all of those manufacturing jobs, it's likely the need to innovate (biotech, computers, etc..) would not have been nearly as strong. At the same time the money needed to create those industries may not have been available (cycle of wealth).