Americans have the highest rate of civilian gun ownership in the world, with 4 in 10 saying they either own a gun or live in a home with guns, according to a 2017 Pew Center study.
The top 5 countries with highest gun ownership per 100 residents:
United States: 120.5
Source: Small Arms Survey, 2018
Countries with the most mass shootings 1966-2012:
United States: 90
Source: Voice of America