Are you the OP posting under a different account?
> Given its size, configuration, and geopolitical contexts, the US has few comparable nations against which we can test.
Why does country size affect academic performance of students?
Russia, China, India, and Mexico are not developed nations. I wouldn't compare their educational results with the US. I'd be more interested in Canada, South Korea, Japan, Singapore, Australia, New Zealand, and the European nations. The USA compares near the bottom of this list.
> No, it isn't. The other nations I just listed by comparison churn out very few humanities degrees.
You used humanities degrees as a strawman argument in the OP. You asserting you did not do that is just a waste of effort. Perhaps you need to look up what a strawman argument is?