Does the US have more mass shootings per person than any other nation?

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.