How did the Tinker v Des Moines case expand the rights of minors?

The Tinker v. Des Moines Supreme Court case concerned two students who wore black armbands to school to protest the Vietnam War. ... The First Amendment protects the students' right to wear the armbands; they weren't disruptive, and the school allowed others to wear controversial symbols.

Explanation:

The Tinker v. Des Moines case expanded the rights of minors.

The case is about a group of students in Des Moines who planned a public showing of their support for a truce in the Vietnam war, The principals of the Des Moines school created  a policy that stated that any student wearing an armband would be asked to remove it, with refusal to do so resulting in suspension.

The students sued the school district for violating the students' right of expression, however The district court dismissed the case and held that the school district's actions were reasonable to uphold school discipline.

The Supreme Court held that the armbands represented pure speech, and The First Amendment protects the students' right of freedom of speech.

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