It is illegal in the entire country. That is the general idea of the Supreme Court; it has national scope.
Specifically, the motivation "correct the effects of structural racism" is illegal when a public school is engaging in affirmative action. Affirmative action is generally legal, as long as you have a legal motive.
It turns out, though, that it's really easy for people to lie about their motives.
What supreme court decision are you talking about? You might be right, but the only decisions I could find eliminated quota systems, and required schools to take more than just race into account. I would be interested to see the case you're talking about.
Specifically, the motivation "correct the effects of structural racism" is illegal when a public school is engaging in affirmative action. Affirmative action is generally legal, as long as you have a legal motive.
It turns out, though, that it's really easy for people to lie about their motives.