While the US cannot claim the top spot in the number of homicides by firearm among the world’s nations, we can claim the top spot of homicides by firearm when done en masse. The United States of America is far and away the world leader in what is commonly called mass shootings (4 or more people). The LA Times tried to put together some of the available evidence to suggest possible causes for our #1 status:
And the New Yorker has this excellent piece about how to put a stop to it.
From Harvard Magazine: