How did Columbine change America? In the years after the tragedy, Americans feared copycat crimes, that children would carry out deadly school attacks. In the 10 years since Eric Harris and Dylan Klebold struck, numerous teenagers have plotted to blow up their high schools, and several have proceeded to the action stage. But none has succeeded. Others have sought to kill with automatic weapons, both in and outside of schools. Some succeeded, but most of them, too,... (GunPolicy.org)