I am an Asian who finished K12 at my native country before migrate to the US. It's a combination of a lot of factor:
- Curriculum: if I'm of a conspiracy mind, I would suggest common course math is not designed to lay foundation, but designed to shatter student's confidence in math because they're so convoluted they have to be on purpose. This is not a hyperbolic, but even if you had learnt Calculus from another country, you'll struggle to make sense of elementary text book over here. And what if I'm not of a conspiracy mind? The most generous assessment would be the curriculum is designed to satisfy the adult ego, rather than to teach kids.
- Social pressure: in Asia the reason why school tend to be more successful is because the attitude they take toward educators in general. They still get shit pay for the most part, but at least they get respect, mine actually put educator a rank above parents. People also understand the saying "it takes a village to raise a kids", so there tend to be a united effort to make sure kids can learn. This means holding the teachers responsible, but also the parents as well. In America, educator received shit pay, has no respect, but have to shoulder 100% of the responsibility while being neutered to the point of having no power over the kids. This lead to a situation that not a lot of people want to go into this career, leading to a permanent shortage of instructors, and the one you do get tend to be the bottom of the barrel.
- Politic: education basically have become a free for all of ideology politic. The left will blame the right for budget cut and religious influence, the right will point at the infiltration of activism poisoning ... and the scariest part is? They're both right. I mentioned "bottom of the barrel" earlier, what his mean specifically is: if you're lucky, you get people who became educator as their plan C due to them either lacking talent or couldn't compete in the field or in the industry. If you are unlucky ... you get activist ... not educators. Take science and biology education for example, from the right, you'll have "educator" who want to blaster religious overtone on it, from the left, you'll have educators who prefer to teach gender identity over actual biological difference. Basically, a lot of conversation about education in the US has nothing to do with education, but more about ideology politic with both side vying to shape the younger minds to their liking.
So no, I woundn't say NA's education in the US cooked, more like being burnt to a crisp.