https://www.wired.com/story/the-looser-a-states-gun-laws-the-more-mass-shootings-it-has/

It happened again. This time, gunmen in El Paso, Texas, and Dayton, Ohio, murdered 31 people and injured at least 50 more in separate mass shooting attacks within 13 hours of each other Saturday night and Sunday morning. It was, in many ways, just another weekend in America, the only nation in the developed world where horrific gun massacres regularly occur. Though nothing new, the frequency of such public mass shootings appears to have accelerated over the past five years, along with larger and more tragic death tolls. According to one recent analysis by The Washington Post, a mass shooting event has claimed the lives of four or more people every 47 days since June 2015. In the mid-’90s, such attacks happened just twice a year, on average.

But this surge in public executions has not swept across all corners of the country equally. Hawaii, for instance, hasn’t seen a mass shooting since 1999. Florida, on the other hand, has had six such incidents, defined by the US government as four or more people killed by a single individual, in the past three years alone, according to data from the nonprofit Gun Violence Archive. And like other forms of gun violence—including homicide, suicide, and unintended accidents—researchers are finding that mass shooting events happen more often in states with looser gun laws.