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The Columbine High School Massacre
Littleton, Colorado, United StatesApril 20, 1999
On April 20, 1999, seniors Eric Harris and Dylan Klebold carried out a meticulously planned attack on Columbine High School in Littleton, Colorado, killing 12 students and one teacher and wounding 21 others before turning their guns on themselves. The massacre fundamentally transformed school safety in America, spawning active shooter drills and security protocols nationwide. It also sparked intense debate about media violence, social exclusion, and gun access for teenagers.