North Carolina does not have a shortage of students who can do advanced mathematics. It has a shortage of seats, a shortage of teachers to stand in front of them, and ten separate decisions about who is ready, each made by a different body, each using a different definition of the word.
Below are seven things that are all true at the same time. Each one is defensible on its own. Together they explain how the group of students the state guarantees a seat to shrank by 89% without anyone deciding it should, and why nobody can tell you what happened to the rest.
The long view
None of this is new
Hold measured achievement constant, and access still depends on who the student is. That has been found in every decade since the early 1990s. Each year below links to where it is set out with its citation.
This finding does not keep recurring because nobody noticed the first time. It recurs because nothing in the system is built to catch it. Each study is a one-off, funded by somebody, and when the funding ends so does the measurement.
Where to go next