Not true, US spends more on pre-college education than nearly any other country https://nces.ed.gov/programs/coe/indicator/cmd/education-exp...
I already know the answer, because many in my family are lifelong teachers. All money goes to facilities that don't always need it, though are still good investments, and administration.
The current process sure works well to say "well we keep throwing money at it and nothing improves" as if you can LITERALLY just throw money in the general direction of the problem and see an improvement. As long as those prioritizing funds and resources continue to just ignore teachers wholesale, we will see no improvement in education.
Also, there are different regions and schools where different ways of spending money have been tried. The best results you'll find in the literature are temporary improvements that wash out by the end of high school. The worst results are not even that.
It's not surprising students did better as they were younger. Poor districts expose children to bad outcomes earlier leading to poor performance in school, obviously during the teenage years.
Obviously we're past that point at many places, and not enough in others. But if the underlying issue is poverty outside the classroom, I don't see how lack of money isn't the cause.
In any case the difference is quite clear. If a school in a rich suburb doesn't get much federal money than, say, a inner city school, that gets a lot. That rich suburb already has money. They obviously wouldn't get further funding - but are likely much richer?
Possibly entire states and nearly every city for decades is not enough time, success may be right around the corner!
Good luck!
As streptomycin said, you are wrong.
New York City spends more per student than anywhere else in the US (<https://www.silive.com/news/2019/06/how-much-does-new-york-c...>). Baltimore, an incredibly poor and run-down city, spends the third most. #4-6 and #8 are all wealthy suburbs of Washington DC, but their schools are all far better than those of Baltimore or NYC on average, despite Baltimore spending slightly more per student and NYC spending 60-70% more.
Money can only do so much against dysfunctional families immersed in dysfunctional ethno-societal groups.
An interesting note here is that in the US, federal government dollars are not a major funding component of primary education (k-12). Less than 8% (around $60 billion) of the total cost comes from the federal government; the rest comes from state and local property taxes.
https://educationdata.org/public-education-spending-statisti...
https://www.pgpf.org/budget-basics/how-is-k-12-education-fun...