Columbine had a major effect on the way US schools deal with violence, threats or even just weird kids. 9/11 had a profound effect on how the US deals with ter

Columbine had a major effect on the way US schools deal with violence, threats or even just weird kids. 9/11 had a profound effect on how the US deals with terrorism, threats of terrorism or even just brown people. Certainly not the first, but probably the events with the most lasting effects.