[bongoman42]

Could also be Covid sequelae showing up. Many blue states significantly delayed opening up schools post Covid and the effects are only being apparent now.

[garciasn]

TIL sequelae:

se·que·la; /sēˈkwelə/; noun; plural noun: sequelae

a condition which is the consequence of a previous disease or injury. "the long-term sequelae of infection"

[bongoman42]

Sequel comes from the same root.