When justices fortas refers to keyishian v. board of regents in the majority opinion for tinker v. des moine, which kind of reasoning is using to support his argument?

How did magellan's discovery of what is now considered the philippines directly affect the native populations that were living there? a.they disappeared deep into the new land and started another settlement b. they became aggressive after having a new religious view upon them c. they became restless to travel the world on the ships they encountered d.they became angered over losing their lands' raw goods like fruits and spices