The definition of mass shootings varies, but research has found the U.S. has the most.
Reasons include high gun ownership, “cultural factors like individualism and fame-seeking, sensationalized media coverage, and gaps in mental health care and law enforcement,” said James Densley of the Violence Prevention Project Research Center.
According to two peer-reviewed studies:
U.S. mass shootings accounted for 73% of all incidents and 62% of all fatalities in developed countries from 1998–2019.
That study’s author wrote in February there were 109 U.S. mass shootings from 2000-2022 and 35 in comparable countries. The U.S. accounted for 33% of the population of the 36 countries, but 76% of the incidents and 70% of victim fatalities.
The U.S. had 30.8% of all mass shooters from 1966–2012, despite having less than 5% of the world’s population.
Democratic U.S. Rep. Mark Pocan made the U.S. claim after a mass school shooting Dec. 16 in Madison, Wisconsin, which he represents.