I wonder if there's been an evolution that's gone down, without our noticing it. For most of the 20th-century, the U.S. was certainly the world leader in extending education widely among it's populace. So, might it be that the 20th-century was essentially based on or founded on, what American children were being taught?
But eventually...the world grew beyond all that, to the extent that at least some "stuff" was happening independently of what American kids were being taught? As far as I'm concerned, all things considered and per capita, our American education system is STILL one of the best in the world. Yet...we're rightfully concerned that everything isn't growing straight from what our kids are being taught.
If that's the case, it's reasonable to guess that our American education system IS the best it's ever been and at the same time, we're not "appreciating" the dominance feedback, we once did?