Las Vegas Was the Deadliest Shooting in Modern U.S. History. Here’s Why ‘Modern’ Is So Important

In the days since Sunday's shooting at a country music festival in Las Vegas, as Americans have struggled to comprehend the meaning of the event, one fact has been a stark reminder of the act's impact: that, with at least 59 dead and more than 520 injured, it was the deadliest mass shooting in modern U.S. history.