Final answer:
The Supreme Court ruled in the Tinker v. Des Moines case that students could express themselves by wearing armbands to protest, as long as it didn't disrupt school, thus protecting students' First Amendment rights.
Step-by-step explanation:
In its ruling in the Tinker v. Des Moines case, the US Supreme Court overturned the original decision made by a district court in Ohio. In its 7–2 Tinker decision, the Supreme Court ruled that students had the right to express themselves through wearing armbands as a form of protest on public school grounds, as long as doing so did not disrupt schooling. The Tinker case is important in that it protected students' First Amendment rights.