It is perhaps too easy to forget how many times this has happened. The horrific mass murder at a movie theater in Colorado in July 2012, another at a Sikh temple in Wisconsin that August, another at a manufacturer in Minneapolis that September—and then the unthinkable nightmare at a Connecticut elementary school that December—were some of the latest in an epidemic of such gun violence over the last three decades. Since 1982, there have been at least 70 mass shootings across the country, with the killings unfolding in 30 states from Massachusetts to Hawaii. Thirty-three of these mass shootings have occurred since 2006. Seven of them took place in 2012, and another five occurred in 2013, including in Santa Monica, California, and at the Washington Navy Yard. The first five months of 2014 brought another bloodbath at Fort Hood, Texas, and mass killings in northern and southern California.
(Interactive map in link)