No generalization about American public schools is valid. Every State, every school district, and every school building has its own peculiarities, some of which are efficacious and some, not so much. The thrust of this thread is whether the U.S. Federal government has any role in public K-12 education, and it does not. The Tenth Amendment remains in force.
My personal view is that States should have ONE school district, state-wide, and if necessary ONE teachers' union contract State-wide, with cost of living adjustments as appropriate. It is positively bizarre that two districts in the same County should have the huge disparities in funding, facilities, and teacher pay that we see today. It is the State, after all, that guarantees a "free" education to eligible children.