[1] When Tinker was 13, she wore a black armband to school in protest of the United States' involvement in Vietnam as a member of a group of students who decided to do this.

'"[3] Tinker shared her thoughts on this in an interview: "We had examples in our life of people who really sacrifice and the Birmingham kids, four of them were killed for speaking up against racial segregation.

The case claimed that by suspending them, Des Moines Public Schools had infringed on their right to free expression as enshrined in First Amendment.

On February 24, 1969, the Supreme Court found that by suspending Tinker and her peers for wearing the armbands, Des Moines School District violated the students' First Amendment rights.

In Tinker, the Supreme Court's decision set the legal standard for student free expression for many years.

Tinker v. Des Moines served as a platform for many other cases dealing with the Freedom of Speech in public schools.

Oster alleges the school "selectively bann[ed] her viewpoint" by initially insisting she and her fellow gun supporters stage their protest near the school's front door, far from where the crowd of anti-gun violence protesters demonstrated on the football field, and keeping them "out of everyone else's sight or hearing.

[7] During the fall of 2013, the pair traveled 15,595 miles (25,098 km) across the American east coast, midwest, and southeast, speaking to more than 20,000 students and teachers at 58 stops, including schools, colleges, churches, a youth detention facility, courts, and several national conventions.