Oregon is mentioned as an example of the general decline through the US. The article isn't really about Oregon specifically:

    Consider Oregon. Had it merely kept pace with inflation, it would have
    increased school spending by about 35 percent from 2013 to 2023. In
    actuality, it raised spending by 80 percent. Over the same period, math
    and reading performance tanked, with math posting a remarkable 16-point
    decline—the equivalent of 1.5 grade levels. Oregon is spending much more
    and achieving much less.

I think that Oregon teacher salaries have gone up quite a bit more than the national average in the last 10 years, less so in the last couple.

My youngest child is just starting high school at the moment, and for the last several years much of math education seems to have been farmed out to really crappy software and short video clips running on chromebooks. She'd really be suffering without parental intervention.