On a sunny late morning earlier this week, a little blonde girl, her class on a break, sat alone at her wooden desk inside a classroom at the San Geronimo School. Her attention was focused downwards, at her carefully moving hands. She was knitting a purple sock.

On the other side of the two-school campus, an energetic group of first graders was beginning a Spanish lesson. “Buen-os dí-as Señ-ora Shea-fe,” the kids chanted in unison.…