It depends on where you live. US education is heavily decentralized, in rural kentucky it was still possible until the early 1980s to have 1-12 (kindergarten would have been a pipe dream) in the nearest town. Most districts consolidated first the high schools (9/10-12) and then middle schools (6/7-8/9), but I'm 45 now, I attended a half-day K-8 in my local town. Our local population supported about 1.5 classes (~40-50 students) per grade, so we had a bunch of splits
half day Kindergarten
regular 1st
High 1st/Low 2nd graders
regular 2nd
regular 3rd
high 3rd/low 4th
regular 4th
regular 5th

at 6th grade, a close by k-5 elementary joined with our population
high 5th/low 6th
2 rooms of regular 6th
3 rooms of 7th
2 rooms of regular 8th
1 room of the highest math aptitude ones, we got pre-algebra in 8th grade instead of their general math and our reading was generally higher so we might have read 1 or 2 extra books over the year in our english class
The 4 K-8 schools went to a common 9-12 high school, so that would lead to a 9th grade math breakdown like:
2-3 sections of honors algebra 1, we would net out 1 class of 12th grade AP calculus AB from this
2-3 algebra 1 these kids would end in trigonometry and geometry in grade 12
2-3 pre-algebra these kids would end in algebra 2 and basic geometry in grade 12
2-3 general math these kids would end in algebra 1 and basic geometry in grade 12
The district I grew up in has changed since then, they've got a common 7th-8th building now and the 9th graders attend an isolated building of their own (7-12 is on the same giant physical campus in the middle of our county)

Larger urban districts like the one my kids attend now have opportunities to slot and track high math aptitude earlier, there are some 6th graders that take pre-algebra so their end target would be trig as sophomores and AP Calculus BC as seniors

How much of that is taxes that have increased?

While I agree there are 'red-handed' cases where the truly (earthly) irredeemable deserve the death penalty, the state has demonstrated they can't or won't apply it fairly and correctly.

Apple doesn't make a 'server' for running workloads like this in a sane fashion

Mammoth/Flint Ridge system probably interconnects the Toohey Ridge and Fisher Ridge systems within 5 miles of their known limits to the south and east, we just haven't found the spots yet.

And energy to do it with, good luck getting California to build nuclear plants to do the work.

Yes, we paid up for ~300 RHEL6 servers for 8 years, put in zero support tickets. We're not on the fringes of what we do, we don't have a massive army of sysadmins, just some competent puppeteers. As we moved out to a hybrid cloud strategy, the rhel licenses just didn't make sense so AL2 for workloads that made it to AWS and Centos on-prem. Never once in the last 5 years have we felt like we've missed out on anything except a couple of sales and marketing lunches.