On Sunday night, Stephen Paddock opened fire on a crowd of festival goers in Las Vegas, killing at least 59 and injuring hundreds of others. The event has been named the deadliest mass shooting in modern American history.

The maps below chronicle each mass shooting that has occurred in the U.S. since 1982. Using data collected by Mother Jones, we have mapped the spread of these shootings, both geographically and by number. “Mass shooting” is defined as an incident during which four or more people…