Dan Dempsey, via a kind email:

Fact: Indian Schools cannot fill 10% of teaching positions with highly qualified teachers.
It seems that the US Government is violating treaties.

Recalling Arizona and wars and war settlements let us recall the “Long Walk of the Navajo” in 1864. Navajos were forced to walk up to thirteen miles a day at gunpoint from their reservation in what is now Arizona to eastern New Mexico. Some 53 different forced marches occurred between August 1864 and the end of 1866. Today the Navajo are on the largest Rez in the USA. Part of that Navajo treaty settlement included a commitment from USA Gov to provide schools and schooling to the Navajo nation. Perhaps Gov policy is welching on that deal.

Each year Tribal schools and Bureau of Indian Education schools have 10% of total teaching positions go unfilled by certified highly qualified teachers throughout the USA.