Short form: They are not being trained. The U.S. education system is broken and at the mercy of “educators” and unions like the AFT and NEA. Americans, born and raised here, are being victimized by an education system that produces an unusable product.
The answer is NOT to import tons of illiterate third world peasants (and their kids) to provide slave labor for U.S. corporations. The Big Business, the U.S. Chamber of Commerce, and WSJ solution of increasing third world immigration makes things exponentially worse and not better.
Tech colleges seem to be doing a good job where the U.S. education system is falling down.