What does citizenship have to do with race?
That was just part of the cover. The real issue: "... social-emotional well-being of students as they grow into thriving, engaged citizens of our community". In this regard, see NYC's current elementary school crisis.
Watsonville was/is part of CA's farming area and historically attracted a large segment of farm workers across the southern border. The teacher probably nailed it, although many with Mexican ancestry are likely now NBC's.
OTOH, I wouldn't want this "teacher" to be anywhere near my children.