Answer:
Tinker v. Des Moines was a ruling of the Supreme Court of 1969, through which an interpretation of the right to freedom of expression enshrined in the First Amendment to the United States Constitution was made.
In the events that motivated the cause, anti-war and pacifist students from different high schools in the city of Des Moines, Iowa, began to carry black ribbons on their arms as a protest and a sign of mourning for the lives of the young Americans and Vietnamese soldiers who were dying in battle.
School district authorities punished these students with suspensions and other disciplinary sanctions, against which their families sued the district. The Court, finally, established that the fact that these children wore black bracelets was part of their right to freedom of expression, and that the Des Moines school district could not limit this right, especially when the fact that they wore said bracelets did not impede the normal development of school activities or violate the rights of other children or third parties.
