The case is Plyler v. Doe
Thank you for that reference Ray76. It remains that the Supreme Court had no clear constitutional authority to decide against the states on the issue of schooling for illigal immigrants.
"A 5-to-4 majority of the Supreme Court found that this policy was in violation of the Fourteenth Amendment, as illegal immigrant children are people "in any ordinary sense of the term," and therefore had protection from discrimination unless a substantial state interest could be shown to justify it." --Plyler v. Doe, Wikipedia
The post-FDR era 10th Amendment-ignoring Supreme Court got 14A wrong again imo.
Again, not only have the states never amended the Constitution to expressly protect schooling as a right, the states therefore free to discriminate on the basis of schooling imo, but non-citizens aren't clearly guaranteed constitutionally enumerated protections even if the states had ratified such an amendment.