Except the United States is one of the most diverse places when it comes to terrain and you've got tundra, open plains, mountains, swamps, hills,etc. The American public's usage of guns for self defense is between 500,000 and three million times a year. https://www.forbes.com/sites/paulhsieh/2018/04/30/that-time-the-cdc-asked-about-defensive-gun-uses/#255cd27d299a